Popping in as an 'RP person' after skimming through your points a bit:
By 'top posts' are you referring to the posts labeled on the side of the thread as having the highest rep? (it's usually 1-2). If so, I would argue that having those top posts in the RP thread is still relevant, in some cases the most repped post are posts that give important details and information. That, and sometimes a post is most popular in an RP because it was particularly funny or well done. While I agree this means it can be somewhat out of context, I think that sometimes having random jokes tacked on the side while playing is kind of fun.
(I made a stupid joke in Cosmere HG, and the fact that it's forever immortalized in the thread stats on the side makes me smile)
That said, it is less important, so if It had to be removed I wouldn't complain.
I'm actually on another forum where this is done on the whole site and within the RP section, and it helps a lot. You know when a joke lands if you get laughs, and you know when a joke doesn't land when you don't lol. It really helps with communication and gauging who has seen and interacted with what when it comes to the group.
Additionally, that site shows you who the post was reacted too by (you click on the reactions at the bottom and it shows you a list of names). I really like this for inside and outside of the RP section because it helps you know who saw your communication and what they felt about it. It helps a lot with clarity. I know there is some merit to anonymity, but I personally wouldn't mind things being un-anonymus when it comes to reactions.
I like this a lot too, though I don't think the most common reaction should be interpreted as the vibe of the RP, lol. There's a good deal of joking around that happens out-of-character in very serious role plays, so if this did happen, then it wouldn't be the most accurate gauge of emotion.
Personally, I find myself never looking at the titles, and instead the number of rep on an individual. The rep count will tell me how much someone has contributed to the community, but the title is just a title (I don't have the ranking of them all memorized besides the first few, so the title for 1000 rep is the same to me as the title for 3000 rep). That's entirely my subjective opinion, however.