There are a few other compile/transpile bugs here and there.... but I'm rooting for the it!!! Hopefully they can get sorted out soon.
Yes, the installer automatically (and reliably) resizes partitions for you. A minimum of about 70 GB for macOS is needed (anything lower is still possible but unsupported).
> You pick it at boot?
There's a default choice that will boot.
> And how “install and just use” it is?
Probably one of the smoothest Linux installs I've had in 10 years or so, since you just run the installer from macOS instead of flashing ISO files to an USB drive.
USB-C output is indeed not working but actively making progress (so actively that some of the related patches have been sent to the kernel mailing list and merged this very week).
There's a bit of a pain in that I could only get Brave to run Netflix, but all that meant was that I switched to using Brave for all of my browsing.
There's no official Tor build for it, but there is an unofficial one (that I do not use)
The only real pain I have with it is that Facebook's javascript for its reels chews up RAM something horrible, which freezes the OS whilst being processed, and often causes me to reboot it
The Framework (Intel 12th Gen) also has the added benefit of heating the house, particularly with graphics "heavy" workloads (lots of windows open in GNOME Mutter, VMs, etc).
The linux distro automatically shutdown if I shutdown the VM. I am using swaylock to lock the screen when I am away.