In addition to @mikeloc I’d want to share that Ideaboard was updated a month ago:
So it seems (haven’t visited ideaboard for a while) that prior to the recent update users were not able to comment on ideas. That’s also why forum has been much more active in terms of ideas sharing and commenting 
Also Bubble team hasn’t promoted Idea Board a lot. Top #1 requested feature has 830+ votes, that’s a damn small number. I’m not even sure that a lot of Bubble devs are aware of Idea Board existence.
And yep, we don’t know the criteria of idea acceptance. At least any small feedback or status from the team on posted ideas would be great (“in the backlog”, “TBA”, “denied” with a reason and so on)