The point is that these two are separate questions, and that trying to use comments as a crutch to join the two religiously is a headache. It's impossible to keep everything in sync and I don't want to read needless or worse misleading information.

What's worse, in comments we often omit the important details such as why was the change made, what other choices were considered, how was the thing benchmarked, etcetc.

That said, comments still have a place. Just not everywhere for everything and especially not for documenting history.