Individuals can deal with that, but companies will have a hard time. You would think the Linux Foundation (LF) would chime in with all these differences. But they seem more concerned with AI than Linux these days.
If it was up to me, I would standardize on OpenBSD's doas, but me doing that would make for more incompatibilities.
That happened 30 years ago. Userland is not compatible. Too many distro related patchese, especially on Debian/Ubuntu.
The only common denominator is libc because daddy Torvalds doesn't allow the kids to break it. That's why things like snap work but come with a full blown os stack inside.
doas is ~ 1k LOC of easy to understand C code. It can quite literally be made 100% bug-free.
But it was never about that, never about finding a better replacement. It's about religious proselytizing of their chosen language.