That's unfair. Blender did undergo some big changes, but they were more than justified. It's not like they're just continuously changing it, or that the changes weren't warranted. I think Blender is a better tool today because of their changes.
I have much more of an issue with GIMP. Pushing forth changes that the vast majority of the userbase hated (and railed against on the forum), and got a big "FU, if you don't like it, use another tool" response from the developers. Comments on the "can only save XCF through the save menu, changes to other formats pester you about "unsaved changes" even if you do export" design change were over 10:1 against. The brush size slider is a mess. Text editing is broken in about ten different ways, from it forgetting what font size you're typing in to not rendering full text deletion in some cases. The general quality has gone way downhill. Meanwhile, things that have supposedly been "in the works" for years, like higher bit-depth colour, seem further away than ever. Even if I didn't want to export to a higher bit depth, if I want to do a gaussian blur on a high-res image I need to do a combination of dithers and blurs because of the loss of precision at 8 bits per channel.
Facebook is the classic example of terrible product evolution (particularly Messenger... have these people never heard of the concept of screen real estate?). I'd also like to zing Google for Google Maps. Today it's way slower, they took the very convenient full-length zoom bar out (and only put the tiny one in after user complaints), buttons with similar functionality are scattered out (e.g. satellite is on the bottom left, but landscape hidden in the menu top left), photo integration is terrible (no longer shows photos where they actually are, but in a giant "bar" on the bottom of the screen, opened by an ambiguous icon that looks like three different buttons, with lines that point to the map seemingly at random), make you zoom in twice as far to see the same amount of map information (ex. road labels), added icons to the upper right that have no connection to Maps at all just for "product consistency", and so on. And it's 2017, why is their landscape option still so terrible? Even little local companies' map services have vastly superior landscapes.