The main problem with "we don't break userspace" is that all general statements are false at some point. As what point is some specific instance considered by

The main problem with "we don't break userspace" is that all general statements are false at some point. As what point is some specific instance considered by everyone incorrect that it doesn't get fixed? This is a strawman arg since I know it is simple enough to create new interfaces to bypass old problematic approaches and Linux is full of evolution.