Jonathan, when I was starting out (Fly Fishing) I read every book in the library I could get. First starting with the newest ones, then after I understood the newest technologies, i.e., Rod material, Fly lines, etc. I read through the older books to get the stuff that never really changes.
Its very similar to lightweight backpacking, there will always be new materials but there is a constant base of information that supports the whole system that never changes much over the years.
Be careful, I can see that you can get slightly obsessed (I've watched you with buying and selling gear). This sickness can run ramped as well with Fly Fishing. I have as much fly Fishing stuff as hiking gear.
I confess, I'm a defeated, consumed man. You too might be heading down that slippery slope.