I assume you're trolling, but it has nothing to do with complexity. It has to do with the player being willing to invest time into a product they haven't seen yet. The aversion is to the possibility of spending 15-20 minutes registering for a game they know they don't like after 5 minutes of play.
Account system or not, I think it's wise to have at least some form of 'guest' access where someone can pop in and start playing immediately. If you're worried about abuse, this mode can effectively be 'single player' by restricting their access to communication, especially mass communication.
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