I do believe that adding value to the community is all subjective and included a longer time frame than a single post.
It isn't all subjective. For example, the work that goes into a hardfork is immense and very, very practical. Does it value, yes - but it is hard to enumerate what. Not everything can be put in numbers, but much of what would be seen as adding value is pretty clear.
I do not have the answer as I do not look at all posts from a timeframe perspective other than a few accounts I follow.
And this is part of the issue on Hive, because the history matters. On other platforms it doesn't, because the algorithms decide. Hive is about people, the other platforms are about profit.