So expected limitations in your cases is "known to the developers ahead of its release", but what happens with the software after release, e.g. after 10 iterati

So expected limitations in your cases is "known to the developers ahead of its release", but what happens with the software after release, e.g. after 10 iterations or 2 years or 10 years? What happens if your product from 10s of users grows to 1000s of users, millions of users? What happens when new functionality must be added and it collides with the existing one in multiple points? You can and you must do your best, but you can't do everything - you must choose what is your sacrifice.