This sounds like a you problem. I'm a casual player too, but I have 0 issues with the difficulty this expansion. Yes, the stuff took 1-3 tries for me to learn, but they are not so difficult if you pay attention. I learned to the extent that I know that most of the mechanics this expansion heavily use "order of resolution", or "the order that the mechanics are performed in." There's always a first and second mechanic. And they almost always resolve in the order they appear in. Such as Valigirmanda's tank buster/pushback combo. The tank buster always appears FIRST. Therefore, the tank buster always finishes FIRST. Then its followed up by the pushback aoe. Even if they are close together, mechanics dont overlap to the degree that they resolve at the same time.

If you have issues with others dying so much, then wait to do the content for about 2 weeks so people have time to get the duties down.

If you are running around like a chicken with your head cut off, you need to stop panicking and start paying attention. The tells for mechanics ARE NOT subtle. I also died a few times to Honey B. but I took the downtime to learn the mechanics I was seeing so I could know them better instead of getting frustrated and complaining. And while my party wiped 10+ times on the bomb dude, most of the party still learned the mechanics well enough to complete the fight. That instance was down to the fact that most of us were not paying attention at first and going into autopilot. A habit that resulted from running easier content on a regular basis.

Ive done unsynced EX runs at max level every expansion to some degree for mounts, and even unsynced, the EX trials are harder than what we got this expansion for normal duties.

This stuff has been a breath of fresh air compared to the snoozefest of Endwalker duties.

The Warrior of Light on normal was more difficult than most of the duties this expansion so far. If you completed that duty, then you have no excuses for not being able to learn the new duties.

And stop griping about failure. Just because you "cant" now does not mean you cant get better at it. I learned recently that someone in the FFXIV community does EX trials synced and they have a screwed-up hand from it getting run over as a kid. But they are completing something more difficult with that disability than most people have without said disability.