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feature creep

n. The tendency of a design project or product cycle to accumulate more and more features or details, rather than to be completed and released at a more basic level.

Wikipedia
Feature creep

Feature creep, creeping featurism or featuritis is the ongoing expansion or addition of new features in a product, such as in computer software. These extra features go beyond the basic function of the product and can result in software bloat and over-complication rather than simple design.