but wayland actually can't do accessibility. If it needs custom protocols that are not part of wayland, then wayland itself isn't the one enabling it

Wayland core can barely do anything. The vast majority of Wayland functionality is split between wayland-protocols and xdg-desktop-portal.

If you say "Wayland can't do interactive window resizing" because Wayland core doesn't have xdg-shell, well, it's maybe right by some twisted logic, but it's utterly useless and confusing to users who think that it means they can't when using Wayland which isn't true.