I think the design is fine to an extent, it just punishes people who expect it to be breezed like normal dungeons.
I say because ive had potd clears on 41-50F with craptastic setups with
4 healers (super squishy kite master),
4 tanks (no heals mutiple Cairns of Return yohoho pox),
4 DD (kiting galore)
I honestly have a mix n match of any number of diff. classes than 4 of each as it an be an honest nightmare
but it can be fun and challenging and sometimes laughable if you know how to be careful and wary.
But this is assuming everyone in the party is using what they need to. (proper skills, potions, situational awareness)
Most people are so used to potd as a breeze that parties with unexpected 'cracks' wipe them.