I‘ve had this issue on several distros and multiple friends have the same issue. Video hardware acceleration in a browser is a mess. This is definitely not only affecting me as there is a significant amount of complaints on forums and reddit.

And there is no way that the average computer user will use arch. And as long as you gotta fiddle around with your system to get even the most basic shit running smoothly like watching a high resolution youtube video and moving around windows on your other screen at the same time linux will stay irrelevant as a desktop os. It‘s still a system for nerds and I kinda feel like that this is okay.