Sync could simply be explained as the process of making everything the same in multiple places. In terms of an RSS reader, I think it’s the technical cornerstone of the tool. Information doesn’t care where you are or what device you are on. It is created at breakneck speeds, and you should be able to manage it from anywhere on any device. While this is a clear value proposition, not everyone would agree, but there are other reasons why sync is important.
I used to care about syncing feeds. But there is so much to read out there, I decided it wasn’t worth the effort. There are so many sources to choose from, you can simply have different feeds in different readers/devices.
And the must read feeds show up on techmeme anyways, so you’re not going to miss any *breaking* stuff.