There really isn’t one. Wayland is maturing and app support is following.
This is the way things always go in open source. I’m betting soon there will be a distro that will announce a never Wayland stance just like Devuan prior.
It's been working for a while unless I'm misunderstanding what you mean by screen capture. But I've been using OBS on KDE Wayland capturing via portals for months now with issues.
I just tried it. Create a "Screen capture (PipeWire)" source, there's a popup asking you to pick a display or "Full Workspace" which shares everything.
The one that bother me the most about Wayland is the future of *BSD desktop. Can you run Wayland on NetBSD/FreeBSD yet? Also, currently you can run x server on Mac so you can run X11 apps remotely for example. Is there any attempt to make waypipe work on MacOS?