This could just be a coincidence, but I saw two different bands lately where everyone was using in-ears. Neither band had a dedicated sound man. One of the bands started with no vocals in the house mix. The other band barely had any vocals. I know what happened. Each person had their own mix that sounded fine to them and no one went out front, took their in-ears out and listened. I know the advantages of in ears. I use them with a click in two different bands. But I hear problems with bands that use them. One is stage volume. Because they’re basically wearing ear plugs, they can’t tell how loud they are. Everyone plays way too loud for the room. Another is that they listen to the click track and not to each other. They don’t seem to really lock in with each other. I suppose this is just a new thing that separates the armatures from the pros.