Earlier quoted context omitted.
Agreed, very curious how much of that actually gets even glanced over. I thought I was information overload with ~150 sites. I hope OP uses the 'focus' features so they can get a modicum of information from those 2350 feeds.
But is your intention really to read every post by every site you're subscribed to? Someone subscribed to over 1000 sites isn't trying to avoid missed posts - they're just dipping into the stream of sites they're interested in at any given moment.
One nice feature of newsblur, which I don't use often and not sure if it is available in other readers, but the intelligence trainer would probably help in instances where you have a lot of sites and don't necessarily bother reviewing all posts.
Maybe I just use RSS readers differently. But if I were just going to periodically review what a site has, I would probably go to the site periodically rather than clutter up my list of feeds.