Because let's be real here. The problem we are seeing right now with Crystal Tower is the fact that Crystal Tower is steamrolled to the point it might as well be a misrepresentation of Alliance Raids as a whole.
However, a lot of pushback I tend to get whenever I bring up minimum iLv Crystal Tower with my friends is "It'll be too hard! It's required by the story otherwise people are going to get gated!"
Yet look at Dawntrail's dungeons. Have people been dissauded and unable to progress MSQ because of the dungeons themselves? No. The World of Darkness is the only piece of Crystal Tower content that isn't Steam Rolled into oblivion by overgearing, not to mention Syrcus Tower has mechanics that are COMPLETELY SKIPPED(Daybreak on Scylla, Platforms on 2nd Boss, DPS Check on Xande being extremely trivial).
But really: Just how is this representative of Alliance Raids when even VOID ARK has mechanics that require attention to? Crystal Tower is the only piece of Alliance Raid content that is so bare bones it might as well not even be there, even if it is required for MSQ to progress. The reason why they did this was because of 5.3, but leaving it in its current state does not represent the difficulty stated by any other Alliance Raid even at Lv 60.
"But it's supposed to be easy! It should be able to be done without any kind of trouble or difficulty!" That's the problem. Difficulty. Crystal Tower from what I remember back in ARR had a difficulty to it that was a step up from your average dungeon crawl. Healers had to pay attention to things that applied to them. DPS actually had to meet checks and watch adds. Tanks actually had to tank and live.
It's not rocket science. It's also why Crystal Tower is so BORING for a lot of people - we don't get to interact with things aside from just punching down on the boss repeatedly until it's dead. Even Amon doesn't stand a chance and we can punch him down outside of dealing with Curtain Call. Behemoth and Dullahan in Labyrinth get punched down before they get to do anything or implement any of their mechanics aside from Ecliptic Meteor. If Crystal Tower is simply "how fast can you punch down a boss" compared to Void Ark where mechanics are still active as ever for fail states, then why keep it as just punching dummies?