If it bumps it up the queue at all: I’ve been wanting to read someone pitch this way of thinking for what feels like an age.

Personally, I went all in on border-box as agency work is always design-lead. When the work is “make this picture in css”, anything other than border-box will drive you insane.

But it’s been a few decades of us pushing responsive design, so I’m curious if content-box doesn’t have its merits. I still don’t quite grok it from your explanations here (though I will re-read them), so would love to read that essay.