The problem is that quite often what comes out of the developing tank is nothing like as brilliant as what you saw in the viewfinder. I've had shots which ticked all the "rules" off but were best described as "meh" when developed.
As for wastage, this annoys me with later bodies. My Super A insists on winding and shooting three times at the start of a roll before it will meter properly or allow you to select a shutter speed, meanwhile with a KX I can shoot frame 0 onwards and get at least one more exposure. The AF bodies are even worse for winding through film leaders before they'll let you shoot.