The only problems with my Arch install were
- /etc/fstab, which I forgot about because I didn’t read the whole install article again
- custom configs (notable conky) because i8k is not available and all interfaces changed
I’d guess many distros would’ve had errors with preinstalled and configured helpers. Debugging them would be a pain
Gentoo, LFS, Arch etc. are installed manually, so one typically knows their system very well, including packages and configs they might have to hard configure interfaces etc. in