@ ForteNightshade

Umm . . . it's not just new or anxious tanks. Even our OP agrees that the issue is not always black and white. Some tanks might downgrade to single pulls to accommodate for the other roles. We sometimes get "Cure bot" healers (that Free Cure trait) and / or single target DPS (because Alisaie does it and the animations look cooler, right?). I am kidding with the brackets.

Sometimes the tanks may very well want to mass pull too, but can't because a few other group members wouldn't be able to handle it. At the same time, I wouldn't want to just kick them from group since they may very well become great healers or DPS later on. Maybe talk to the group nicely if you want them to learn the ropes faster?