I sometimes send an email with 1) the things that don't work, 2) terrible ui, 3) possible improvements. Most often I've moved on to similar software that does what I want.

I get responses like. 1) It works for me, 2) you should have looked at this and that, 3) no one wants that/it works fine the way it is.

The worse part is that they wasted their time reading and responding.

I've had wonderful feedback on things I've made. The funniest were people who didn't understand standard ui convention. It had me wonder if I can expose mission critical parts some other way in case the user doesn't know how a hamburger menu works.

Imagine my shock when I learn a young user conditioned by modern flat buttons thought [shall we say] windows 95 industrial buttons are decorations. You can click on that???

If I pretend it is their problem I haven't actually solved anything.