Isn’t there a physical limit to solving this problem? For me the problem is typically, that the water in the hot pipe has cooled down, so the first few seconds/half a minute it slowly rises in temperature until finally the pump of the boiler sets in to pump actually hot water back into the system. Only then can I reliably find a temperature mix that stays stable.
It depends on what you were raised with. For me I have all these relevant points in my head for C. 25 is nice, under 20 you slowly need to dress longer stuff. Over 30 is hot, over 40 sucks hard, over 50 can become deadly soon. Body temp is around 37.
Ah then it is fine. No judgement. I just wanted to make sure you don’t underestimate their implications and your wording sounded a bit like you consider them the normal baseline.
a sounds reasonable. But b and c sound like big expectations where I would doubt that I could fulfill them all the time and then I would disappoint. So these two points sound to me like a lot of pressure.