How to distinguish between essential features and features that can be deferred when building an application

A Simple Test to Help Prioritize App Features Before Development

An app founder can easily generate a long list of features in a short amount of time. The real challenge, however, lies in determining which of these should be included in the initial development phase.
A practical way to make this decision is to imagine the app without a specific feature and ask: "Would the core service still be functional, or would the user journey become incomplete or impossible?"
If removing a feature prevents the user from completing the primary task, it should be given high priority and included in the initial scope.
Conversely, if removing a feature merely results in the loss of some convenience, customization, or extra options—while the core service remains intact—it is often worth considering whether that feature can be deferred.
This test helps avoid making decisions based solely on a feature’s outward appearance; some seemingly simple functions may be critical, while other large, complex features might not be necessary for the user at the outset.
It is also important to consider how many users will benefit from a given feature. A function required by the majority of users deserves a different level of attention than one that serves only a rare, edge-case scenario.
Furthermore, one must evaluate how a feature aligns with the project’s business goals. A function might be essential for completing a sale, a booking, or a subscription—even if it isn't the most prominent element in the user interface.
On the other hand, some features may be attractive from a marketing perspective but come at a high cost without contributing directly to the success of the core user experience.

Why an Appealing Feature Does Not Necessarily Belong in the First Release

When studying competing applications, a project owner might be drawn to various advanced features and feel compelled to include them from the very start. However, the mere fact that a competitor offers a particular function does not automatically mean it is essential for a new project.
Applications that have been in operation for years may have reached their current state through dozens of updates; therefore, comparing a first release to a mature product can lead to an unrealistic expansion of requirements.
An essential feature must, first and foremost, be tied to the core value the application aims to deliver—there should be a clear reason why its presence is necessary for the user to complete their primary journey.
An "appealing" feature, by contrast, might enhance the customer experience or provide an extra layer of distinction, but it can be deferred if the user is still able to obtain the core service without it.
It is crucial not to conflate what is required for an application to function correctly with the desire to pack it with as many options and add-ons as possible.
In some cases, investing in the speed and usability of the primary user path is far more valuable than adding a suite of new functions that merely increase the number of screens.
Furthermore, every new addition can introduce unique use cases and edge cases that require design and testing; consequently, the actual impact on the project’s scope may be far greater than it initially appears when the feature is first proposed.

The user journey reveals what should be implemented now and what can be deferred.

One of the best ways to distinguish between essential and secondary features is to map out the user journey, step by step—from the moment the user opens the application until they reach their intended goal. This journey reveals needs in a practical, concrete way.
Instead of discussing each feature as an isolated idea, you can determine where it fits into the journey, what problem it solves, and what the consequences would be if it were absent.
If a feature is necessary to transition from one stage to the next—especially if the completion of the entire service depends on it—it should likely be included in the core version.
Conversely, if a feature merely provides an alternative path or an enhancement without affecting the user’s ability to complete the task, it may be a suitable candidate for a later phase.
This approach grounds the planning process in a real-world experience, rather than relying on a long, disconnected list of features.
It also helps uncover smaller features that might otherwise be overlooked, even though they are essential for connecting the various stages of the journey and creating a cohesive, complete experience.

How User-Centric Value Helps Determine When to Implement a Feature

When weighing a wide range of potential application features, cost should not be the only consideration. Some functions may be easy to implement but offer limited impact, while others require greater effort yet provide fundamental value to the user.
Therefore, it is essential to evaluate each feature based on the problem it addresses, the frequency of that problem, and the number of users who will benefit from the solution while using the application.
A feature used by most customers almost every time they interact with the app typically warrants higher priority than one designed for a rare scenario—which could be addressed at a later stage.
It is also important to determine whether a feature is critical to completing a core task, or if it serves merely to provide extra convenience or additional options once that task is finished.
These questions help shift the concept of "priority" from a subjective opinion to a clear, objective decision that can be discussed among the project owner, the design team, and the development team.
Each party can articulate why a specific function is important, the impact of postponing it, and the risks that might arise if the application were launched without it.
In some cases, a feature may be necessary not just for functional reasons, but due to the nature of the business, security standards, or operational requirements—in which case, it must be assigned the appropriate priority.
Conversely, a feature might be desirable because it makes the product appear more sophisticated; however, its absence in the initial release may not pose any genuine problem for the user or the business.