You may be right, but I've seen some whales that aren't very good bloggers and some minnows that can write their butts off. I don't believe so much in limiting posts to a max per day, but quality of posts is something that should be compensated and spammy or low-quality posts should be limited. So my take from all of this is: maybe a post should be published only AFTER it has been upvoted by at least 3 random minnows or 1 whale. Steemit could choose randomly a predetermined amount of members and show them incoming posts. Once a post receives three "minnow" votes or one "whale" vote, it graduates to "new". I really believe that would get rid of spam and low-quality posts for good. Replies, however, should remain unlimited.