However, as a result, 21 hard forks have made it more profitable to upvote less times
Well I just gave you an example of an account that votes 10x as much and has ROI about 2x higher, so clearly this is not always true.
What is most profitable is complicated and not a matter of just number of votes. That's actually a small factor if at all.
RE: 스팀 21하드포크는 실패작이었습니다. 21하드포크 제안자들은 더이상 나대지 말았으면 합니다.(Steem 21 Hard fork was a failure. 21Hard fork propositions don't want to go off any more.)