Now all valves seem to come pressure balanced showers even faucets. are mixing valves even necessary anymore?

Is their any application that they are useful or needed. The only example i could think of would be being able to divert super hot water to clothse washer or sanitation devices but they would have to have multiple ports one for Tempered water going to fixtures one for cold, one for hot to mix, and one straight hot from the water heater that is piped directly to sanitizing fixtures. I think watts makes one like that.

For what reason would you install a tempering valve on a hot water system?