These are, unfortunately, falsehoods that keep getting perpetuated despite efforts to the contrary.

While you can become slightly more tolerant with repeated exposure (as you can with anything noxious), the the discomfort never goes away.

And it's not just game character motion. Any camera movement can trigger it, at different levels for different people. If you don't get triggered, count yourself lucky, and don't tell the rest of us to "just practice" or attempt to explain away that it's only X and not ABCDEFGHIJKLMNOPQRSTUVWYZ. Listen to what we're actually SAYING.

I still remember Valve responding to complaints of motion sickness in Half Life 2 with the lame excuse "It's because our technology is so amazingly lifelike." I wanted to punch the guy in the face and ask him if that was lifelike enough for him.