You and Judah missed my point. I'm saying that its not going to increase the amount of bad players because of the level jump, but rather its going to occur for the same reason it's occurring now. The jump in mind isn't going to straight up drop you off at level 50 or 60 (with a 70 cap), but rather have a series of introduction quests where it introduces your job abilties. How long do you genuinely think it takes to understand the foundations of positionals, 1-2-3 combos, and job mechanics with an npc and tool tips explaining it to you? What exactly are you expecting in a EX roulette, because there is a huge difference between someone who doesn't understand basic gameplay mechanics (and deals sub 400 dps at i220) and those who do but don't optimize it (which would hover around 800 for example)
You're not looking hard enough, there's literally a tab in your spellbook that shows your core abilties, recommended usage and when/how to use it.
The interface is all there, and you can always click the exclamation mark for more information on skill setup. This is no different from FFXIV where you read your abilities as you gain them.
You even mentioned it yourself that people leave because there's nothing to do at level cap. That and a level boost are not mutually exclusive to each other.
Again, I'm not advocating for a level boost as of now, it's far too soon into the game's life for it to be necessary. However I feel taht they do need to trim down the fluff on the MSQ, because that;s ultimately the bottleneck to how fast you can progress, not your level. Though alot of the reasons people keep saying it's a bad idea just doesn't make sense provided that the boost is properly done, nor do people acutally understand why WoW blundered as bad as it did (and its not because of the level boost, I can tell you that right now considering I've played my fair share of it).