Is there a problem with the code or nobody's interested in this particular implemention ? 🤔

I think the last one. These suggestions are very old ... and still not implemented, because the developer left the Steem after the fork...

can be an encouraging tool for authors

Could be. In the sense that users are interested in the exchange under the post or perhaps want to read the topic again later...
But it could also be depressing...

post-success-meter

I don't know what the context of this suggestion is, but I also think it's not an easy task. Basically, it would be along the lines of realrobinhood's trending posts, wouldn't it?
You could also have a look here. Remlaps is currently analysing the possibilities of suggesting the value of a vote.

!finanzbot 7%