>>jedber+(OP)
These things aren't mutually exclusive and the commenters who want to get better (and/or develop more resilience to mild online criticism) do so just fine without the noise cost. There are lots of other ways one could try to dampen the unpleasantness that don't involve the extraordinary burden of receipts for downvotes.
I guess that's probably the best way to summarize this argument - the extraordinary burden demands extraordinary benefit and not even the people who are really into this idea often argue the benefit would be commensurate with the burden.