O.K., thanks Blink!
Much of that is greek to me, but I think I get the gist of it.
1) We can back up our jailbroken phones, but it's a real pain to restore.
2) We should do plenty of research into JBing. Yes, I did the equivalent on webOS with Homebrew and, because I did it since they started offering it for the Pre, I took for granted all that I understood about it all by the time I left the platform when Sprint got the 4S; now I'm starting over and have to learn a whole new vocabulary etc.
For example, your cautions about firmware and blobs etc. don't make sense to me...yet. My problem is I haven't had time to do the research and slog through the weeks of learning JB. But I know I'll do it eventually because the benefits of Homebrew on the Pre and Touchpad were worth the hassle, so I'm guessing that's true with IOS, as well.