Let me just address the casual PvE normal dungeon pugs. I pug them with both a tank and a healer. If it is higher level players looking for a speed run, they just blast through and it really doesn't matter what you run as you run to keep up. You get to fights too late to either tank or heal anyway and that can be frustrating. On the other hand, I find plenty of normal pugs that are simply newer characters trying to learn/get through the dungeons. Those groups tend to quite appreciate and need a dedicated tank and healer.

The tank is harder in pugs because you are relying on random players to provide reasonable dps and also for them to let you (as the tank) initiate pulls. I think this is why many tanks refuse to run pugs since they are often thwarted in doing their jobs.

A healer is a different matter. Most healers can do moderate dps as they heal and, by nature, follow the group to keep an eye on them instead of try to lead like a tank does. So my healer who pugs normals quite enjoys and is very able to adapt to the unexpected twists and turns that random normal pugs provide. A healer - again, because of their moderate dps ability - is generally quite comfortable running solo quest content without being tempted to make changes to gear/spell slotting.

One advantage if pugging on either healer or tank is that they are in demand (because of the reasons above) and therefore experience notably shorter wait times for dungeon queues.

Hello,
If your on PS4 EU I can help you out finding your feet even run dungeons or talk gear and builds with you if it’s somthinf you’d like message me.
reynoldslad93
Happy gaming 😄