Windows 11. The "EOL" of Windows 10 could also be considered a UX choice.
I also recently upgraded from an iPhone 13 mini to a 17, and I'm still not used to the larger screen size. Phones that can fit comfortably in your hand and pockets are in short supply.
AI-"enhanced" Autocorrect can be a nightmare, especially when you're talking about niche topics, or different languages.
Infinite scroll and addiction-as-product-design is a scourge on many.
Previously non-algorithmic news sources that now algorithmically feed you headlines.
Lots of websites have a slightly-but-noticeably degraded experience on Firefox.
The Internet at large without uBlock Origin.
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Most of these are not design "choices" though, they are profit motivated. Good and/or humanist design often tends to be at odds with profit these days because attention is currently primary vector of exploitation for companies.
"More Usage" != "Good Design", but people do like to be employed and receive a paycheck, myself included.
I read text and sometimes I can interact and click/tap it for some action but other times it is just text. Not having a visual distintion between those two seems hostile. But maybe I'm just showing my age.