I disagree. I mentioned both of these dungeons specifically for a reason. In both the rush rush meta we have and "the way SE intends it to be played" as I'mma gil it, you can clear just fine currently. Tanks who multi-pull usually do so because they can handle it (and good ones adjust if healers/dps cannot) and single pulling, while mind numbingly boring for experienced players is unhindered entirely.
Even in Holmister and Don Mheg we had enemies like these. The fuath in the latter would enlarge a mob if the tank didn't interrupt and make things harder (I've had many tanks either not know this or don't care and mass pull anyway) the former again has hard hitting mobs.
I'm not asking for SE to make these things more difficult by having multiple targets that need to die asap in a single pull (read: one pack of mobs) nor am I asking for both priority targets and hard hitting mobs to be in a single pull. I'm asking for the difficulties in these two dungeons to stay and be made into level 81-90 dungeons as we go forward and for all lv90 (and if possible 80) dungeons going forward keep this same difficulty.
These two dungeons aren't perfect I do think they could be improved if even slightly, but I do think they're done well as they do present some challenge for multipulls as you've pointed out, while also not hindering small pulls in anyway.