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Problems with the right side
- may interfere with longhose (and therefore OOA emergencies)
- may interfere with can light (which I don't own)
Problems with the left side
- may interfere with SPG (might clip it to the bottle instead of d-ring)
- may interfere with dumping the wing (but not much)
I'm not sure anyone advocates a single bottle on the right. Clipping the SPG to the bottle is a minor irritant at worst, but trapping the long hose could be real bad.
All the tech training I have received emphasizes proper clipping, clip order, and teaches proper dumping with a bottle attached.
They are both non issues even as you add more and more bottles.
So learning the left will help if you ever go dir.