One way to consider this is to put yourself in the mind of a product manager with kids and a mortgage. If you declare the product is "done", the company no long

One way to consider this is to put yourself in the mind of a product manager with kids and a mortgage. If you declare the product is "done", the company no longer needs you to improve it. That means trying to find a new role in the company at best and getting laid off at worst. The same goes for UI designers who keep reinventing the wheel in different ways or devs who keep refactoring the same functionality from monoliths to microservices and back. In an ideal world, the company owners (those who would financially benefit from reducing ongoing development costs) would be up to date enough to realize the product is "done", but in all but the smallest companies there are too many layers between them and the products for them to make this assessment accurately.