Lets look into this a little closer rather than just blindly throwing opinions.

Looking at the entire log they uploaded, there's 2 key wipe points that stand out:

https://www.youtube.com/watch?v=ug8wMt1cU2w The first mechanic that killed them most frequently. - This isn't a heal check whatsoever, it's just a particularly precise dodging intermission.

https://youtu.be/KNEuMpgvwkY?t=754 The second mechanic that caused repeated wipes. - This is much harder to read and understand what was going wrong, I'm not sure if the group themselves has explained it? My best guess is that it's down to a sequence of mechanics that uses the healers as targets for hits that need to be soaked across 4 making it a bit of a pot shot as to whom actually gets targeted.

As an outlier it could also be LB3 generation? They need to use the LB3 to survive Ankh Afah reliably (Due to the healer having to stand alone) and they didn't cast it on any of the 4 wipes that I looked at at that point.

My opinion from this?

Eh, anyone who's paid attention to DSR knows that it was never really a healing check anyway. It's absolutely the most intense test of mechanics, precision, dps and mitigation in the game yet. But in terms of sheer healing throughput required? It's no higher than what we already see in Savage, adjust for the stat squish and it's less Damage taken per second than E12S's door boss.

IMHO it's just further evidence that SE have backed themselves into a corner with this. E12S's Door Boss was about as hard as they can push healing requirements with the toolkits we had then because of the way our MP economy and GCD healing kits are tuned. Until these aspects get a serious rethink, I don't think we'll ever see the sort of healing check that many of us are hoping for because the game simply can't support it as things stand.

If there was ever a clear sign that SE needs to make our kits more interactive within themselves, this is it IMHO.