yes I know archinstall, no I don’t think it should be how someone installs arch for the first time.
the manual install for arch is pretty simple if you just read the wiki and you learn so much troubleshooting information from it. if someone is trying arch they should definitely go through the manual process
maybe? I think knowing how to reinstall your boot loader at least is very important though, for the inevitable case of having to deal with a windows dual boot computer somewhere