Yeah that's a good point, but I don't see any other way hosts can practice. I mean, ok, the host needs to have some experience to host ANY game, but where does he get that from? Even a seasoned player can be a really bad host, so it won't come from experience as a player.
Beginner games are, unfortunately, the "best" choice for beginning hosts I can see, whether it's a good idea or not. We could make a category for "games hosted by new hosts", but honestly who would want to play in something like that?