Making people go scrounging over ten subs is the ideal way to reduce your subscriber base. It’s also a shitty model for a link aggregator and a terrible way for people to ask questions and get answers. Not all of us have ten hours a day to scroll through multiple communities on the same topic, with the same article posted 8 times with 8 different discussion threads and some goober posting the same inane comment on all eight. It’s a waste of time.
There are perfectly good reasons for similar communities with a different focus to co-exist. Making the Fediverse harder and more Byzantine to use is a terrible reason to want it, though.