Earlier quoted context omitted.
Your example sounds more like typical Firefox to me. While I use it as my daily driver, video calls should always be done in Chrome in my experience. (Yeah, I know that is not exactly a point in favor of free software but it is what it is.) Honestly at least relative to the general mood of the software industry I wouldn't say that foss projects don't care about backwards compatibility. The kernel is famous for caring…
Why are you doing video calls in a browser in the first place ?
I don't see the issue, yes Teams is crap in Browser but most WebRTC based solutions work fine, at least in Chrome. Plus if I can avoid installing proprietary Software that is always a plus.