one of the neat little things about slashdot was that voting included a short reason, like 'insightful', 'funny', 'redundant', or 'offtopic'. then as a user, you had some control over the visibility of comments based on those standard evaluations. that seems more viable to me than requiring a full comment on each downvote (though i like the idea in principle), which would likely devolve into these one-word evaluations as comments anyway.

i wouldn't worry about getting shadowbanned unless you're constantly posting thoughtless and provocative craziness (which doesn't seem likely based on a very quick perusal of your comment history). i read with showdead on and find very few accounts being shadowbanned, and those that are continuously and blatantly violate hn rules (nevermind common courtesy).