I don't know what is barely any engagement. I see a lot of posts on trending with 30 or so comments on them. Also if you look at the trending many of these posts are quite fresh, people comment sometimes within a day or more after the post is posted. Many are waiting for a bunch of comments to come in before answering them etc.

In case of OCD you would have to speak with others who are currently involved in the project, I believe OCD had evolved a lot also in how it operates and has many programs to support Hive creators.

It seems you have not been around much to see how all these things developed and evolved, I suggest getting familiar with them once again. I am sure your views would also change once you saw all the recent developments.