No, there really is`nt a technical reason, you just need to work up to it and when you start learning to ride switch, you have to go back to basics like learning to ride all over again, go slow and pick terrain that you can spend some time with the board pointed straight down the fall line without acceleratiing rapidly. Just put the exact same proceedures into play and it will work.
If you have a free ride board (non twin tip) with a directional stance setback and progressive sidecut, the board will definitely respond different, but you can learn to ride it switch very well with practice. Trust me, it takes some time and dedication to get the switch riding; even more so if you tend to really have a very dominant direction to fight against.
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