I've noticed you don't see the pivot type valves anymore where you can just go up and over to hot right away. Most shower valves now are turn-throughs, where you start at cold and go up to hot. Having installed a few now, I think this has to do with the federal law for having a scald prevention device in the valves control (much like having a low-flo device in shower heads.) Both instances, they are plastic and so you can remove them or adjust them later. I think it's just easier to make a scald prevention device for a turn-through valve than a pivot valve and that's why most shower handles suck today. It's just a tiny plastic piece that impedes how far into the hot range the handle will go.