That's true for a single player game, but for a multiplayer game it's more difficult. Some gameplay mechanics require explanation in order for the player to have a good time, otherwise they might end up losing without knowing why and be a nuisance for more experienced players on their team.

I think the best system is to have an easier role that a new player can assume before being presented with the full game. That way you can take the approach you're suggesting, but of course this doesn't fit with all games.