Sounds like Echo is working as designed then. "Fail until you can brute force" is pretty much what the mechanic is for. All of the mechanics you mentioned were found previously in dungeons and NM trials too. Perhaps not as punishingly implemented, but they were there.

It's good that the playerbase got a wake-up call with this fight... the game is so, so easy for the majority of content and if one fight that makes you pay attention is enough to put panties in knots then I don't know what to say. Git gud for the one fight that asks it as part of story progression? Get carried if you just can't do it for some reason? I mean it's over a year later with > 70 ilvls over what the content was designed for, if people can't stop getting knocked off the platform then they really need to get it together because the outgoing damage is not going to be a big problem for most of the group at this point.