Yep that is exactly right, jailbreaking for apple is like rooting for android. Gives you permission to do things to your phone that the company doesn't exactly want you to have access to. Now there is no permeant root for the Shift at this moment in time, only a temp. root so every time you boot off and on you have to do it again.
Um its all a personal choice with rooting, you know? some may want to, some may not. Its all with what you have in mind that you want to do with your phone. Change settings, delete bloatware, get access to free wifi hotspot, then root? if these things are necessary then don't root. I rooted my Evo, but I am not going to root my Shift. Most the times if something goes wrong while rooting or rooted, your warranty has now become void by sprint. I don't really need wifi hotspot and i can deal with bloatware to keep my phone under warranty.
any other questions just ask, and i will be willing to help if i can!
maybe give me a thanks here and there on my comments, if i help a lot! joking.
Welcome Also!