depends very much on where you are, unfortunately. in USA, this is definitely not the case, they're almost all incredibly dumb. especially the cheapest-possible models that most renters are forced to use (and renters account for about a third of all households).

as a concrete example, the video has a section in it where he shows that his doesn't so any sensing - hot or cold water have exactly the same timing on the heater's use (and resulting water temperature graphs).

so like. I agree with you that it should be true, it's simple and cheap to implement and it obviously works better. unfortunately it's not a sane reality for tens (hundreds?) of millions of people.