Well yeah, that's how Debian gets around the issue. However Arch doesn't have an RPM converter in it's standard set up (or if there is, I'm unaware of it).
Personally I massively prefer Arch's package manager to anything I've seen on any RPM-based distro and it seems pretty pointless in having an "alien"-like RPM converter for Arch given how exhaustive Pacman + AUR is. However the point remains that Arch would fail LSB due to this.