This is old news. Nvidia did have issues with wayland at first, but that was quickly fixed. Most of my machines have Nvidia graphics cards, and all of them run Wayland flawlessly. I suggest that you try it on your machine if you want to see how well it works in your case though, mileage may vary.

Yes. It loads faster, it has integrated quality levels that increase while loading (so a web hoster doesn’t need to have 5 different copies of the same image at different qualities), it has better compression and it also supports more features. It can also be lossless. Most importantly, jpeg can be converted to jpeg xl losslessly, and it will have the benefits of jpeg xl.