It's challenging content, that's proven across the board otherwise the clear rates would be up there with savage.
I do agree there is a difference sense of people calling ultimate "easy" when they didn't clear it during the same savage tier it came out. Like if you cleared all three in 2020, that's a bit different. There is the after-effect of clearing later like I mentioned of having better dungeon gear with the +5 ilvl, and better strats that have been tried and proven to cut down on DPS checks, and to allow for more errors. Like UwU nowadays you can practically add up dead bodies over time and still be comfy on enrage. Not to cut down the accomplishment, just people calling it easy is not telling the full story.
Same ordeal with people who cleared Eden's Verse last tier in i500 gear will say the tier is easy versus the first month gang that had to work their way up with early strats and ilvl. Like some healers got a wake up call when Eden's Promise came out and they realized they actually needed to heal at min ilvl.