Yes, I agree the syncs should be readjusted to at least tier syncs if not minimum item level. The problems mostly happens with content that was released earlier in the expansion. Anything released in the final tier survive a lot better, although sometimes that is a little less fun as well.

Since you gave the example of Void Ark, that was released in the first raid tier, about 100 item level lower than what we sync down to, so naturally none of the mechanics even matter nor are they threatening.

Weeping City had 3 bosses that I personally witnessed walling alliances and causing them to abandon or leave, when it was current. But the moment the raid tier was over and our item level increased, the whole thing became a joke. Ozma got skipped right to the black hole cast really fast, which is an add phase and then it dies shortly after that, which made it a shadow of its former self.

There used to be a different boss instead of Proto Ultima. The boss that is Proto Ultima was the fanfest fight from what I recall and they have to make that easy because people are not used to the keybinds on the computers there, nor are they necessarily good at the game (they might be journalists). Proto Ultima replaced the fight that was previously there and the raid then gave a reward we could exchange for accessories that were potentially BiS, something they haven't replicated since from alliance raids.

Let us be honest, we've all requested this for years and Yoshi-P has been asked directly about it in a media tour interview and nothing changed. All we can do is hope they eventually do something, but they don't seem to be in any rush.