Frame perfect rendering, and heterogenous and fractional DPI are the main user benefits today. Future benefits that we might get as a result of the improved stack include better crash recovery for display servers, better multi-GPU and hotplugging functionality, and better support for variable refresh rate/HDR/etc. Also, the new stack is about far more than just the Wayland devs, but as someone who has implemented a Wayland client from scratch in Go, I do not believe it is at all worse than Xorg. The biggest issue I can see today is rough edges where different compositors implement the protocols differently. But, that seems to improve over time, and users of UI toolkits generally needn't care.
Most Wayland compositors outside of GNOME, KDE and Weston are wlroots-based. Whether the packages have been added to Arch repos is kind of neither here nor there, a lot of them are reasonably mature and will do what they say. Wlrobs for example will work just fine if you want high performance screen capture inside of wlroots without relying on desktop portals.
XWayland apps scale fine, they just don't render at high DPI. I agree this is bad if it's most apps. That said, you may not have realized but a lot of apps that start in XWayland today work fine with Wayland/XDG Shell with a command line flag or environment variable. Chromium and Electron apps will switch soon when the ozone platform hint flag is changed to default to "auto". That means that Firefox, Chrome, Electron, SDL, GLFW, Qt 5, Qt 6, GTK 3 and GTK 4 apps can all start in native Wayland assuming the apps themselves don't depend on X11, including many tricky ones like OBS. Even Wine might soon have a native Wayland driver[1], further knocking down the number of apps that hard-depend on X. (For me, the main ones I can think of are Krita and dolphin-emu.)
I think the vast majority of Wayland issues today just stem from the NVIDIA experience. And to be fair, that is a completely valid reason to not use Wayland. It's a shame though, because the developers behind Xorg have no interest in maintaining parts of X outside of XWayland. It's tough to break many of these chicken-and-egg problems with 80% of the Linux user base being shafted. Of course, it's not just about Wayland, it's about the whole stack. NVIDIA users had to wait longer to get many basic creature comforts, like KMS support. It's very telling that only one major GPU vendor has issues like this with open source OSes, it's just unfortunate that it has to be the biggest one on desktop.
Of course, everything is always just around the bend. But with improving NVIDIA drivers and concrete timelines for apps defaulting to Wayland when possible, 2023 seems like it might just be the turning point. I'm patiently awaiting new NVIDIA driver releases... (But for now, you will have a way, way better time on Intel and AMD. It's leagues ahead.)
[1]: https://youtu.be/lZ-MK72Kyp8