It's funny to hear that, because we get a large number of complaints that we haven't changed GIMP's interface at all from 2.10 to 3.0 and that's why we're "failing".

We try to be respectful of existing users (and again, we get lots of complaints that doing so "holds GIMP back"). If you have some examples of massive changes you've dealt with (and from what version to what version), I'm happy to look into them further.