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It's not so much about "sites", as it is "apps". The most recent instance I recall is this: https://news.ycombinator.com/item?id=16467387

Open this page in a browser other than Chrome: https://pagedraw.io/tutorials/basics

That makes sense - no it's not right. A "web app" can get away with only being compatible with Chrome on the desktop because they would likely have a native app for mobile.

BoA still claims I'm using an "unsupported browser" when I use Firefox.

Very annoying, because AFAICT everything works perfectly.

Microsoft Teams used to reject Firefox. Changing the UA to Chrome solved the issue.