beginners give up....
because the first thing they see after the grotto is an npc sending you to money-gated content (borderlands), a manifesto of "pay or get out, the servers can't handle a real server population, pay or get lost we don't want you to be around".
because they move too slowly compared to everyone because gearing for run speed is an abomination that should not be in a mmo, standard move speed should be striding 30 and striding effect removed from spell\gear, class bonus or action boost is fine.
because they buy, like, restless isle or sorrowdusk and since it is paid content they think it must be special. this game has always had, has, and if things go on this way will always have so much buyers remorse potential that's mind bogging.
because, related to OP, nothing in the tutorial explains the critical role of sla + metamagic feats. also, they can't possibly know that if you spend 1 AP and hotbar it you should re-hotbar it when you take the 2nd and the 3rd.
because, when they realize the sla are the "cantrips", or generally speaking they made a mistake in a wonderful game with so many build options and an over-the-top wonderful customization system, the best feature this game has, they could respec but nope, this game has no easy respec option. again, pay or get lost.
what about, like, rework the tutorial?
what about, like, rework the slas to be a single version costing 2 or 3 AP and scaled with empower and maximize and heighten always on by default even if you don't have those feats (obviously contextually removing the option to activate those feats for slas) ?