I'm not sure where to put this, so please mods feel free to move it if it's in the wrong place.
In short, the new player experience does a very poor job showing off the good qualities about the (non-narrative) gameplay, and it's getting worse over time, as positive changes pile up over time.
Lets use a really easy example,Paladin. As new things are added to the class, to prevent massive button bloat they have to remove old abilities. This is fine. However, almost all of the things they remove are old class buttons and old class mechanics, that do not get replaced until much higher levels.
In Heavensward at level 60 Paladin had 2 combos, one for mp regen and one for everything else, and 3 combo finishers (goring blade, rage of halone, royal authority) and what you should be doing was heavily dependant on the situation.
In endwalker, level 60 paladin has 1 combo, 2 combo finishers (royal authority, goring blade.) The rotation is 1-2-4-1-2-3-1-2-3 on loop it's *very* boring.
Also, this scares me away from any roulette with low level content in it. Do I want to que as a paladin and risk having only 3 buttons because I get a level 50 or 60 dungeon? No, I do not. I geninely believe this hurts que times for new players in dungeons that are not part of the current expansion. Because once the initial tomestone farming flurry has died down, I am usually simply not willing to risk getting an Alaxander run on the raid roulette or a Dzemael Darkhold in the leveling roulette. This problem is worst for tanks, who both have the simplest rotations to start with, and are the class most in demand for ques.
And every change that lead up to this situation was positive. Tank stance changes were net positive, paladins new moves were positive, ect. But the result is that the version of the class under level 70 or so is dull. And almost every class, including crafters, is in a similar state. For me, having to go though the base game and 2 full expansions before I can finally play the class I'm interested in in a way that's mechanically satisfying is a [B]big[B] ask. I believe that it is doing long term damage to the game, and that damage might be overlooked right now but I do not believe it will stay invisible forever.
In this specific example, I'd say that SE should look to red mage and samurai for guidance. Their entire, core rotation is in place by level 50 at the latest, and I believe this needs to be the case for *every* job. People should be having fun with the combat, not bored out of their head, suffering though it to get to the story for 100+ hours.
(PS, I love this game to death, I make this complaint in an attempt to help more new players love it as much as I do, instead of bouncing off the low level experience)