I'm sure I'm not alone in feeling the "deep expertise" OP laments was actually deeply inconvenient to many people. I understand that there's a good living to be made from knowing browser quirks, hand-rolling accessible components, mastering CSS specificity, but this is largely accidental complexity. More people building things is straightforwardly good, and if some of those things are slower or less accessible, that'…
The really weird gaps and inconsistencies just make it to untrustworthy. I spend so much time vetting all the outputs that it often cancels out the time it saves me, and I find enough errors that I don’t have an incentive to streamline things/not vet it.