You've never heard anyone complain that a particular page looks weird, or that it loads or runs really slow? You seem to mixing up the levels of abstraction as we cross the boundary moving into the car analogy. Cars have industry standards, too. Nobody knows shit about them. But they still care, indirectly, because adhering or not adhering to those standards affects in some way the experiences that the end users do care about. That's the only point I'm making. If you actually disagree with that, I'm really surprised.

I'm disagreeing with the degree of care. I don't think most people give a hoot about web standards. I do think most people care about their car standards/internals.