Do you believe every post should be limited?
My 2 posts took ages to coordinate, I re-wrote them several times over and made a huge effort to make it both informational and concise enough to be an easy(-ish) read.

For example, my last post stands at 20 currently, and I don't feel guilty for it - it took me over an hour and a half to write (including fixing up graphs, working on the script to create the content, and the actual writing of the post). If anything, the ROI is waaaay less than it's worth. I just like sharing my findings and the payout gives me additional motivation to make my posts accessible and clear.

As for those making the post - if these are people actively hunting rewards for minimal effort, then you can't trust them to restrict themselves willingly.
This was one of my questions to who brought me to Hive - how do you keep trash content from hitting the Trending? He mentioned that you can always choose to downvote. But I feel uncomfortable doing so (never mind that my power is non-existent anyway) if it's just "a post I don't care for". If it's a true trash post, I'll downvote.
I hope we don't get to a situation where bikini-clad pics earn the poster lots of votes for no effort. (Nothing wrong with lewds, but not exactly what I think most people come to Hive for)

I tried to look up trending posts, btw - I see 90% Splinterlands updates that seem to be pretty full of content, so no hate from me.