Teams regularly randomly gets worse in many metrics. I will start work one day and something will randomly work differently, with no warning.

One good example is that teams now tries harder to autoformat code. It will refuse to treat something copied from an IDE as just text, automatically put it into some random quote style box, and the process of getting your cursor out of that box to continue writing your message changes and is inconsistent over time. If the recipient of that message then tries to copy and paste that code, the formatting and raw text content will have been changed in unexpected ways, and you have to manually fix it. This is such a stupidly simple and expected use for a chat app in software development workspaces yet it probably isn't an allowed use case at microsoft. Microsoft fired their QA department, so any code path in any app not regularly used by Microsoft staff internally is pretty much garanteed to wander, be inconsistent, randomly break, and change in unnecessary ways.