As a wonderful game series taught their playerbase.

Get good.

It's not supposed to be an attack on you, it's supposed to incentivise the player to literally get better at playing the game. If all you want is a "queue in, one shot the boss, go out", simply don't raid.
Endwalker was already the easiest and honestly lamest expansion, difficulty wise. If they repeat Endwalker in Dawntrail, the game will receive a lot of backlash from the people who do enjoy difficult content.

It's a game. Have fun in it. See the mechanic, die, learn what happened, revive and try to prevent it next time. If you simply want to turn your brain off and not think about a single mechanic, just don't raid or play something else.

"People that strive with difficulty already have extremes, savages, ultimate and criterion" -- Sure. But you think we want ONLY those? For example, criterion is content you do once and never again. Extremes is the same for the people who don't care about mounts. Savages and Ultimates I'll give it to you but even those have weekly loot lock when they're new, so once we clear for the week we got nothing to do until next week.
Meanwhile, casuals have: Normal modes, deep dungeon, crafting / gathering for the collectables if they are into that, roulettes, pvp, fate grinding for extra goodies, Extremes because those are really not difficult when guides come out and even more so if you get friends to go with you.

Yes, would be great if SE released more casual to midcore content, but these normal mode raids are really, REALLY not anywhere near extreme level difficulty.

Again comes back to my first point, get good. Don't take it personally. Just learn to overcome obstacles. Don't expect game devs to baby you for every single expansion. Do some work yourself.