It is pretty annoying if many people/tags you are following repost a post of someone you already follow. Those reposts can flood your stream and make it very confusing. It would be very handy to have e.g. switch to hide those reposts - only the first repost or the original post should be visible.
This has already been discussed many times, for example here: Reshares
It just needs someone who does it.
Yep, the related github issue is https://github.com/diaspora/diaspora/issues/4219
Closing this topic.