Blame the trolls on the Beta forum in 2013 - it was their nonsense and spamming which spooked SE into introducing these restrictions (the forum never had these restrictions back in 1.0 - they were only added upon ARR's launch). And when you think about it, at least having these restrictions ensure the forum isn't clogged with a million whine threads about <insert current minor gameplay issue which players blow out of proportion here>. It at least ensures players have to think about what they're going to say in order to not waste their current posting quota for that day, usually.