The guy from the past teleported to now will not be horrified by the lack of them, but surprised that we manage to do without them

Can you say more about why you believe that? Because it seems unlikely to me on the face of it.

By way of analogy: a lot of people today do seem to believe that punishing criminals is right and proper for its own sake, and would oppose a penal reform that made prison less unpleasant even if such a reform were demonstrated to reduce crime. If transported to a future where criminals were forgiven for their crimes without punishment of any sort and treated with generosity and affection until they voluntarily chose to conform to social norms, I expect that many of those people would be appalled, even if that policy demonstrably worked as a way of keeping crime rates down.

I expect that a lot of people from the Roman Empire would similarly be horrified by our attitudes towards slavery, towards religion, and much else.