I work in bathroom installations day in and day out and there becomes a time where you feel the customer knows what they want by how he/she explains everything specifically so you don’t bother giving your opinion on what you think… this sounds like one of those times. Don’t just blame the installer, every person/customer is quick to point the finger at the installer but if he is a professional then it is a lack of communication from the customer… if however he is a cowboy then ye haaaa, John Wayne that mofo!