What’s the “Chrome with more wayland support” part about? Why wouldn’t that be in all builds of linux-chromium, since major distros are trying to (or already)

What’s the “Chrome with more wayland support” part about? Why wouldn’t that be in all builds of linux-chromium, since major distros are trying to (or already) transition to Wayland? Is there something weird about exosphere that normal Wayland doesn’t support?