Phases of feature development are needed from the strategy designer to inform a roadmap from MVP to mature offering. Phases of feature development are stages or steps that define how a feature or solution will evolve over time, from its initial version to its final version. They help plan and prioritize the scope and sequence of work, and communicate the vision and value proposition of the product or service. References:
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-strategy-designer-certification-prep/create-p