The issue with “premature optimization is bad” is that some see it as a permission to not optimize at all. Hence you eventually end up with a system where everything is bad.
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Although for some of us being obsessive-compulsive weirdos this is the only way of life: an itch that keeps on physically scratching until resolved.
“Be guided by beauty. I really mean that. Pretty much everything I’ve done has had an aesthetic component, at least to me. Now you might think ‘well, building a company that’s trading bonds, what’s so aesthetic about that?’ But, what’s aesthetic about it is doing it right. Getting the right kind of people, and approaching the problem, and doing it right […] it’s a beautiful thing to do something right.”