Just found out, that plasma 6.2 have introduced KWIN_BUILD_X11 and KWIN_BUILD_X11_BACKEND cmake switches for building kwin without x11 support.
I know, that purging all x11 components and still use xwayland for some tasks is not possible, but still building kwin without x11 should have some effect, am I correct? I hope the option to select kwin-x11 and/or kwin-wayland will appear on cachyos repos if so 
Even if the cachy/arch builders choose not to offer packages with the different switches, I’d still be interested in observations (like memory usage) in the different builds, if anyone DOES build and play.
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from the September release notes
The
cachyos-kde-settingspackage now installs an sddm config, which enables Wayland by default for sddm. This has the benefit that refresh rates, resolution, and other settings can be applied to it, providing a better experience. GPUs that do not support Wayland (legacy NVIDIA) need to manually remove this config. We may introduce hardware detection integration for this in the future, but this has not been done.
and then in the changelog:
sddm: On the KDE Installation, sddm will now default to Wayland as the compositor. # Provide Migration changes in release post
I reinstalled CachyOS on the 2nd of this month, with the default KDE installation. You can still install the xwayland-video bridge but I haven’t noticed any significant changes in memory usage. Plasma 6 in itself is a fairly hefty DE without a decent amount of post-install configuration; which has personally got me thinking of eventually switching from KDE Plasma 6/Kwin to greetd & hyprland or wayfire.
That’s not what the question is about, this has nothing to do with sddm defaults at all. It’s about building Plasma without x11 session at all, which, I suppose, made possible by KDE devs with 6.2.0 release.