I think this problem is not at all exclusive to propietary software. Take blender, for example. I spent quite a bit of time learning all the bits of the interface 5+ years ago. When I tried to go back, the software UI had changed so much that basically most of my knowledge and muscle memory is now worthless, having to google how to do every tiny operation. And this is not yhe first "huge overhaul" of the UI and keybindings they've made.
And it's not like you can easily get an old version of blender and make it work just because it's free software. Leaving aside the fact that I'd be missing out on newer features, system libraries get updated and at some point the old version stops working with a random crash. Then you need to start compiling from source and basically maintaining your own fork.
IMO this is what happens with large enough pieces of software where the devs care more about increasing adoption in spite of any happy existing users.
Sorry for the blender micro-rant, they are doing a great job. But still I felt it was the perfect example of microsoft-y behaviour in free software land