Usually there is always something to say about a project when you want to bump it. It could be ask questions about status, news, etc...
In reality, this is not always the case.
For example, I think icopress's bitlist.co ANN thread (on Bitcointalk) should be more visible, but my post there is currently the last one. While I could perhaps provide some other guidance there, that would be writing several posts in a row on my part. Mods are perfectly entitled to merge it all into one post, so it wouldn't be a bump anymore.
An additional problem here on Altt is that users cannot delete their posts, so ordinary "bump" posts are undesirable.