It seems most of the complaints are about the reliability and infrastructure - which is very much often a direct result of lack of investment and development resources.

And then many UI changes people have been complaining about are related to things like copilot being forcibly integrated - which is very much in the "Microsoft expect to gain a profit by encouraging it's use" camp.

It's pretty rare companies make a UI because they want a bad UI, it's normally a second order thing from other priorities - such as promoting other services or encouraging more ad impressions or similar.