No point as of yet I believe. Until Tom Brady and the experts start using it, wouldn't hurt to not bother with it.
There have been some reported glitches, with certain combos landing in one stance, and not in the other. Eg. Kung Lao, BP, BK ~ Spin breaking between the BK and Spin in one stance. These might get patched in future updates.
If it was a game changing mechanism, we would most likely know about it by now. Fingers crossed it gets fixed in Ulitmate MK9 or UMK9.