I was the healer in this group, first like me start out by saying it would have been better if you suggested to the BLM to use Enochian instead of putting them on the spot and asking them repeatedly why they didn't use it. After you said something, she started using it

. The reason the tank said those things was because they were in the same FC. I'll go out on a limb and say they are a couple. Yes, the first boss was taking forever, but there are a lot of new players around now and BLM was her first 60.

This was Fractal, it's not super hard and doesn't require people to know the ends and outs of their jobs. People learn at their own pace. if you want to suggest something they are doing wrong then that's fine. If they change, great! If not, either leave or just stay for the ride.