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> I ended up thinking that we do need physical stimuli. A lot. And that our brain likes to reflect from physical to ideal, if we skip a step, we deprive/depress the system. It will work but less so than having a right blend of physical then ideal brain stimulation.

This. It's especially evident when you're trying to learn: a physical book gives you more sensations to associate with. Taping on a small kindle screen gives you a much less varied experience.