If I remember correctly, both the daily post limit and the post character limit come from the days of 1.0. Not because of poor coding, but rather as a deliberate thing because of the dumpster fire the NA forums were at that time and how abusive people were getting. So they added those as a blanket of measures for everyone, which is about the norm for how things like this are dealt with. Just like housing, we can't have nice things because we've proven that we can't be trusted with said things.