I don't worry about reading every question that might interest me. I have favorite tags, but don't ignore anything. If something catches my eye, I read it. Life's too short to worry about the rest.
That said, this seems to be a topic that has come up over and over. Site Proposals like Networking.SE are 100% overlap with SF, and on historical basis shouldn't be allowed. But there seems to be a growing number of people who don't want the topics of Technology Administration, Engineering, and Architecture to be commingled.
At the same time some people don't want the community fractured. Most people choose a single site and only visit it on a frequent basis, the other sites lose out on their expertise on other fields. I fit squarely in this camp, but I can understand the other point of view.
There's a perfect, concise argument going on in the Merge Telecomm with Networking Proposals Question. TL;DR Version: Telecomm is for "carriers and ISPs", Networking is for Corporate. One persons wants the sites organized by technology, which is almost completely overlap. The other wants the sites organized by audience (fearing the slightly different perspectives will cause people to "wander off").
Stack Exchange's current structure leaves no middle ground, which is a shame.