Real-Time "RT" Patches Updated Against Linux 6.6 Git

[Brittle2]

That's not the point... Name a user-visible feature that you did not already have in X11.

"Right now if you restart pulseaudio your sound might cut out, restart NetworkManager and you lose your wifi, restart an X11 window manager and your decorations disappear.But within a second it's all back to normal exactly where you left off with everything recovering fine.This isn't true for display servers. If X11 restarts you're back at the login prompt. All drafts lost, games unsaved, work wasted.For X11 this was unfixable; clients relied on memory stored by the Xserver, they made synchronous calls that were expected to return values, and multiple clients talked to multple clients.
This was a real problem in my early days of Linux, X11 would lock up frequently enough that most distributions had a shortcut key to restart the server and send you back to the login prompt.It's less of an issue now as X11 has been in a lengthy period of feature freeze.Wayland makes it possible to fix all this. Memory allocations are client side, all operations are async, all protocols are designed that the compositor always has complete control." 😉
[…]
"This isn't just about crashes. If support becomes mainstream there will be additional opportunities:

• We can easily upgrade to new features without having to log out and back. This is one of the reasons why kwin development is happening at such a rapid pace in recent months. We're not having to test in fake nested sessions or waste time logging in and setting up between changes.
• We can support multihead, running different compositors per group of outputs and move seemlessly between them.
• It's feasible to switch between compositors at runtime. With the application handling the reconnect logic, they can easily handle the case where compositor feature sets vary.
• Checkpoint restore in userspace, being able to suspend your application to disk and then pick up where you left off like nothing happened. It could never work for X applications, but with wayland reconnect support we can make it work."

here your answer, hope that it help