Interesting. I wasn't intending to provide both statx() and statxat() variants, just the latter, in which case I'd've though that -at suffix is redundant.
It's certainly fine to provide only *at flavors for any new syscall, IMHO. The * case is always just a simple degenerate case of *at, and libc can trivially provide the simpler user API as well using the *at syscall.
But please keep the uniformity that everything taking a descriptor and AT_* flags is named *at.
Thanks, Roland