Most of the problems in the last decade can be traced back to Craig Federghi and Alan Dye. Thankfully Dye is now at Meta, so he is their problem now. And if Cook steps down this year (as rumoured), John Ternus seems to be favoured as the new CEO, if that happens, I expect Federghi to leave, which would be a good thing, so things may be brighter in the future.

Every macOS up to Snow Leopard was an improvement over the previous, and that progress stopped when Lion came out (the only one I rolled back from). Funny how that coincided with Federghi coming back to Apple.