Now we have the opposite problem, at least in my experience. Everyone just says "premature optimization is the root of all evil" and then uses that as an excuse

Now we have the opposite problem, at least in my experience. Everyone just says "premature optimization is the root of all evil" and then uses that as an excuse not to have a sane architecture just to save a little effort up front. After all, that would slow down the rate at which they could complete user stories for the week...