What would prevent 0/1 Healer clears of content?

[ASkellington]

This can only be resolved by making healers mandatory, either through matchmaking, or through mechanics.

Healers are mandatory in DF. Its why FFXIV doesn't have the issue ESO has where dps can and DO replace healers (and even tanks).

Where ESO succeeds slightly and FFXIV is the last part of your sentance: ESO has heal checks made specifically for healers that fake healers who aren't properly built in stats can't achieve.

Maybe in dungeons, but not in raids. There's always one.

And no. Ultimate should not EVER be able to drop healers. Its the hardest content in the game. It should be testing all 3 roles. Period. Its the whole reason why the content exists.