Ok, so imagine you want to learn to spin switch in the halfpipe, and want to spin down-pipe. Now would you rather learn blindside take off, or try to come across the pipe switch looking over the uphill shoulder (very awkward and unstable).
And there are some people who prefer spinning switch blindside and are very good at it, can do sick switch 1080 etc. Now maybe that's someone who "needs to look over the proper shoulder" or maybe it's a case of someone doing something different, yet still sick.
It's just another skill to learn, and that's a good thing in my opinion, go try all 6 360s one day, you will probably have fun.