It's a dungeon, they're designed to be easy. Practically any dungeon in the game can be cleared day 1 without a healer, especially with a warrior tanking, so why would you expect Dawntrail to suddenly be different? I'd love if dungeons were more difficult but I'm not going to get upset and set myself up for disappointment when I already know the expansion isn't doing anything new with them. Maybe 8.0, but expect the same type of gameplay seen in Endwalker in Dawntrail.

It's not like healers are going to be stuck without being able to dungeons because everyone wants a third DPS. Most people run dungeons through the duty finder with randoms and that forces the typical party composition. If your friends are going to exclude you from content because you play a healer, then they're probably not very good friends to begin with.