I’m sure quality can vary wildly, but the one I have right now seems to keep water hot for the whole house even when people are taking simultaneous showers. I also imagine there are some really efficient tank heaters out there too.

I think at the end of the day, all we can really agree on is that synapsids were really weird looking animals but probably would be like any large land animal who bonds with anyone who adopts them at an early age and were likely affectionate and loving despite how terrifying they were.