Pipewire and wayland are not the default on Debian 11. You can use wayland on debian 11 fine, but pipewire is still not officially supported (https://wiki.debian.org/PipeWire).

While Pipewire is not default, Wayland absolutely is and has been the defalt on distros defaulting to GNOME for a very long time, unless the distro patched gnome to not do so (like debian did with Stretch)

True for debian >=10:

>>As this is the default Debian desktop environment, Wayland is used by default in Debian 10 and newer, older versions use Xorg by default.

https://wiki.debian.org/Wayland

Waiting until screen sharing works under wayland in FF, Chrome etc. Quite a smooth ride otherwise.

This has been working for months (but behind flag in Chrome); what's your problem with that?

Not knowing about the flag :)

Found the Chrome user :)

chrome://flags/#enable-webrtc-pipewire-capturer

Just use Firefox then :)

Please share the flags and necessary services!

In Fedora and with standard desktop spins, it should work out of the box by default, in Firefox.

For Chrome, you need to enable chrome://flags/#enable-webrtc-pipewire-capturer

For more details, what packages need to be installed and what setup done (for sway, for example) see https://wiki.archlinux.org/title/PipeWire#WebRTC_screen_shar... (yes, arch wiki, the principles are same for all distros).