The large tile that has been installed do not share a common plane, so the flat faceplate hardware that spans the transition between tiles leaves a gap where water seems like it could potentially enter behind the foam "gasket" behind the faceplate that does not come in complete contact with the wall.
Further, the top of the tile lip leads directly to the hole in the wall where the valve stem protrudes.
My question is: How important is the flushness of the tile in a shower like this? Would something like this cause damage later down the road by allowing water into the wall and down to the ceiling of the floor below?
A possibly important consideration: a 4 year old shoots the hand held shower water all over this enclosure.