Yes Rob, quite possibly as normal hot water would arrive at probably 50c at most on a dual H & C fill machines. There is some concern with state of the art types that too higher in coming water temp could throw up a fault code and cause a shut down but I haven't heard of any cases of this but that seems mainly because people are unwilling to risk their warranty on an experiment to save a few pounds.
Does that shorten the wash time down? obviously most wash times are based on a cold fill and time to heat the water, don't know if that's by sensor which you should naturally reach the point faster with the warm fill.
It's a similar issue on dishwashers which need much higher water temperature but as you say apart from commercial machines the water is normally heated after the rubber parts. Good news these days a lot of these parts are now silicon so very temperature resistant.