Few points I'm going to heavily disagree with.
80%+ of mechanics in Savage are all present in their Normal counterparts with the only thing different usually being the indicator of said mechanic being something different, whether a lack of an indicator (now a status ailment instead ) or some alternate way of communicating the same info but obscured and then layering of patterns of a sort which may cause you to "solve" it differently occasionally.
As for what falls between an Expert Dungeon and an Ex Trial being Alliance Raid well lets look at it..
Expert dungeon -
Can the party wipe on any boss despite losing a member? All bosses can be solod by tanks alone.
Do they require strong mechanical knowledge of XIV? No, brute forceable
Alliance Raid
Do you need mechanical knowledge? Not generally, brute forceable.
If one party goes down, does the raid potentially catapult into a wipe? Depends on the mechanic you are at and if it requires multiple parties to complete.
Can you clear an Alliance boss with only one party up? In most cases, No but sometimes yes if no mechanics exist that require multiple tanks.
Are Alliance Raids generally recoverable if healers go down? Yes, if you have ress mages but if not, in most cases, no.
Extreme Trials
Can you wipe if you are missing 1 party member? Yes, depending in the mechanic
Generally recoverable with ress mages if healers go down? Yes as long as there isnt a mech that requires 8 ppl
Do you need strong mechanical knowledge to win? Yes, generally not brute forceable
The point being that to find something harder than an Expert, you have to imply some punishing feature, whether it be mechanically difficult or punishing damage wise for failure. If everyone ignored mechanics in Alliance Raid, you definitely can wipe (see first week raids)
Despite being able to wipe in an alliance raid though, they are still brute forceable as most people can fail the mechs and still you can succeed 9/10 times through each boss usually. Any mechanic punishing enough to hold a player accountable to their death, when amplified by x23 players having to do the same, will easily result into a more difficult encounter.
Which means that, yes as I said, the complainers want mechanics they can't essentially wipe to easily and can generally brute force through with enough ress mages. That's simply a fact if we cannot implement body checks that actually hold players accountable to their gameplay skills.