It's exactly that.
Story time
Last (literally) FC I was in wanted to do Tsukuyomi EX near the end of 5.0 unsynched. "Sure, can't be that hard with 8 of us in full Ronkan gear!". I was in full MCH Ronkan gear, the easiest job in the game IMO (No procs, positionals, cast times or RNG {DNC took them} to worry about, just follow rotation with the 50 heat and 100 battery CD and hope ping doesn't mess you up). Maybe it's just my eyes or what have you, but over half the time I would die due to debuff on the player not being the same as the floor half and halfs and die because it started at 4 stacks instead of 1. If I managed to survive that my dumbuttery (gotta keep it clean for the forums!) the meteors phase afterwards was a guaranteed death for me. After 9 tries, I literally said on discord "I gotta go, I can't do this anymore" on the verge of crying because I was failing the so called "easy stuff" so badly I spent the rest of the night with my cats. The FC was very concerned about me and they were not an inch angry at me. I was upset at myself holding my team back.
After that, I swore off doing EX's unless I can solo or maybe duo them. If there was a legitimate thing like DBM I would try it again but those aren't legal in FF XIV.
"How do you deal with real like if this bothers you?" Simple! I'm paid or have to do it to survive stressful stuff. This is a game. A game we have to pay for a monthly fee for. Last thing I want in such a game is more stress to deal with, especially if I'm causing other nuisance in content that "should be easy"
Hmm, I'll have to give it a try! Right now I have AST/WHM in full NeoKingdom (AST with some Queztal), DRG/PLD/RDM in full NeoKingdom too.
Thanks!