Well it's not just that... picture a community group talking among themselves and then some rando shows up, yells "I built this thing that you all might like", hangs out for an hour and then is never heard from again.

I think that's great in moderation as it stimulates ideas and discussions, shows us what folks are working on, etc... but this can't become Product Hunt. The reasons for posting here should be vastly different than posting on Product Hunt.