On the post count request, I’ve personally not found that as a useful data point as prolificacy and quality aren’t the same. My intention was to use the vote up / down metrics for each user as a helpful indicator. If that were displayed with the poster, I’m curious if you would still want to know their post total?
Not so fussed about post total but would rather have it than not given the choice. What I think should be there is date of first joining. This would better address your point re prolificacy/quality as one could see how long someone had been contributing to the forums.