As someone mentioned, This has more of an effect then just gay couples.

ANY adult should be be to designate any other adult as their next of kin and NOT have to explain any relationship between them and not have bio family interfere.

"just being roommates" can be enough of a relationship between adults; that this is the most trusted person they have.

This is a big issue for older adults who not longer have bio family or bio family they can trust. If my only relative is a extreme religious person who beliefs do not reflect my own, I would probably be looking for someone else to be my medical POA.

(Mark is mine so I personally do not have a problem)