I think a charitable reader could infer that this is often made a requirement out of UX concerns and therefore it “needs” to be done. Do you have a substantive objection to what I said?
There are limitations to that, as you well know, since you hedged with “much of.” And this is, again, a nitpick around the edges and not really a comment that addresses my main point.
or have we forgotten that plain hold HTML can validate much of this for us with no JS of any type required?