By custom activity streams do you mean what’s described in this thread?
This is a very niche feature I think and for people who have some level of coding ability and/or time to learn about coding? Maybe I’m wrong but that’s how it seems to me.
Most people just want to log on and have the features they want available for them and I do see a lot of requests for very good ideas/features.
Are these custom activity streams catering for a tiny minority of users at the expense of features that could be useful to a wider user base?