Part of the problem is that each generation of designers want to leave their mark on the product - often by undoing the work of the last generation of designers. They're not entirely wrong. Design has fashions, like clothes. I enjoy that the industrial design of laptops and phones changes every few years. But good UX isn't good because its fashionable. Good UX doesn't go out of date. They've gotta learn to stop fixing it when its not broken.

Eg, MacOS's new system preferences panel is worse than the old one. And its stupid putting the windows start menu in the middle of the screen, where you can't as easily click it with the mouse.