I’m sure some people do it but it’s more difficult notice with three if not a lot. It just feels to me it would happen more with two.
I don't see the mechanism.
You would have a side switch cool-down time. I don't see how two-sides is any different.
As HT said, 3-sides has nothing to do with side balancing. It obviously doesn't do so now. Ask Shane.
ENY is the proper tool for pushing players to balance. You might need to adjust it to bring more pain to bear until you get the desired behavior, but 3-sides has no effect at all.
But don't worry, there is no risk of two sides.