I read currently the recommendation is to run the DHW appliance above code set temp and use this or similar mix valve, to run a code set temp fluid out to taps. But it is "recommended" that the DHW storage vessel be set not to exceed 140. Some say for energy saving-- some say for safety -- no matter. Some fuel systems, like chunk wood or coal, used to charge the DHW vessel could make the storage exceed 140, Since this is only a recommendation -- no fault no foul. If that is the case, then run directly to the dish washer because there is no human interaction with the closed and operating appliance, and hot liquid there may safely be used above 120. I would do that-- but my system only stores and circulates 120 degree liquid. Others that make and store higher temps could benefit from the hi temp sanitation in the dish washer.
I had fits with my mixing valve. I installed it on my boiler. And like I said earlier, in the deep winter when you were in the shower, the water was too cold when the circulator sent the water into the house. So I removed that mixing valve and installed it under the kitchen sink. The family knows that you have to watch out for the hot water in the shower. So yes, every other faucet in the house is getting 160+ hot water.