Indeed. Security (all apps get all keypresses and hard to implement correct behaving lock screens) and multi-monitor with factional scaling per monitor; those were the things that apparently were to super-duper hard to fix in X11.
Maybe a years or two until Wayland gets to full feature parity (except for features Wayland specifically does not have like network support and drawing window borders etc.)
In those same two year I expect all app I use to be running native on Wayland as well. (IntelliJ being the main app I'm waiting for and they are making progress)
Any closed source app could easily contain a keylogger: great feature!
If we want people to run closed source on Linux, we need facilities to sandbox these apps like on other OSes. Flatpak is moving in this direction. Wayland's security also helps.
"was" sure. "still is" it depends on your use case.
for me Wayland overtook X11 as superior in the last year.