Unfortunately in many large RFC discussions repetition means visibility.
Anyway, as someone in the “explicit over implicit” camp I sometimes just give a thumbs-down instead of a comment because I don’t want to derail the discussion with another rehash of “is explicit really explicit”. In that way the thumbs-down works as a signal of disagreement without stepping into the line of fire.
If I see a well-put comment that I agree with, I’ll give it an upvote, but Github discussions make it very easy for those to be overlooked. In my experience the key to getting heard in RFC discussions is repetition, volume and code. Short explanatory comments have a harder time coming through, and a couple of thumbs-down on the top post at least signal that there’s some disagreement.