+1
It could have been done with two instead of three, putting the tub on one of the GFCIs by the mirror, still giving the balanced look. But we don't know the other considerations. One might be that if the tub GFCI trips, it's an indication that something serious could be wrong and you don't want someone just casually resetting it at the mirror, not even realizing it's the tub that tripped it. I'd have the tub on a separate, not as readily accessible GFCI for that reason.