Yes, this is accurate (for security reasons). However you still should not have serious problems with Youtube: https://forum.qubes-os.org/t/hd-video-playback-on-qubes-os-o... (see also a few next posts).

How to fix it if you do have problems: https://forum.qubes-os.org/t/improve-video-playback-performa...

Why did you need Wayland on Qubes?