Right, but this is exactly why this doesn't work: That mechanic has been unclearable in PF so far. Either people do enough damage to clear the boss before it starts (which is possible) or it wipes parties. Most of us have no idea what "Wormhole" is. I saw it come up in a Reddit discussion where people were talking about how hard the mechanic was and I pointed out it's the most difficult version of Limit Cut I've ever seen, and someone said "It's easy, it's just like Wormhole", and everyone else in the thread was like "wtf is 'wormhole'? o.O"
Mechanics that aren't obvious aren't obvious.
As a healer, I figured out a while back no damage negates knockbacks, but that's because I've been healing since 2.3 and noticed it in my Praetorium runs (Ultima Weapon) where sometimes I'd get punted and other times I did not, and I eventually figured out that was what was going on. Had I been a Tank or DPS, I don't think I ever would have realized that was going on.
I've literally never heard anyone say "dynamo/chariot". People say "in/out" or "ring/point blank". Rarely (Hunt community), you'll hear "Bog/Flush" because of ShB's Mudman A Rank, but usually people only say it related to that fight. I've never heard "dynamo/chariot" before ever. I think you're overestimating how universal things within your subgroup of the community are to the community at large. I've also never heard "rot". The term is "tethers". Most people also say "cleaves" not "Limit Cut". Raiders say "Limit Cut". Everyone else calls them "cleaves".
UWU or original? I'm trying to remember when UWU came out, but everyone's had a KB since they implemented Role Actions in place of Cross-Class, right? I never remember when that was, but I think it was when SB/4.0 came out. Though I guess maybe it was just Melee at the time...? But either way, that was kind of my point: The Devs demand more from Ultimate raiders, who have to know a lot of specifics and special nuance. For example, people at one time knew that Fleche used Piercing damage type.
Though I do agree there could be a "shield this" indicator. I mean, we have all kinds now, from stack to spread to lightning rod to prey and on and on. They could have some kind of "this needs to be shielded" indicator just the same.
I'm more saying I highly doubt they'll do it. Could be wrong, but seems like it.
What they'd do instead of weird debuffs, though, would probably just be make attacks that one-shot unshielded people. But then we still run into the mitigation vs shielding thing. They also prefer people being able to avoid stuff like that unless it's a healing check (e.g. the bleed in ZodEx), but in those cases, they're designed to be healing checks (spamming heals/oGCDs after the damage), not pre-sheidling checks that are just a "can you press button <AOE shield> before a mechanic or fail?"