Yeah, I can DO it with my right, but not nearly as well, even though I’m right handed. Same reason. Try the 1-2-1 pattern as well, or simply spread the fingers of each hand as far apart as you can and compare hands.
Yup, 1-2-1 left-handed is cake. And the finger-spread difference between hands is indeed an old party trick of mine. (My left ring finger gets most of the way out to my right pinky when my thumbs and index fingers are matched together.)
The one where you double type the wrong letter (e.g. ‘seel’ for ‘sell’ above) is an interesting one and I’m sure it could provide some valuable insights into human control/transmission mechanisms.
I can do the Vulcan salute with both hands (and all other combinations of fingers). I blame reading Dune at a time when I had too much time on my hands.
Actually, it is more likely to be related to learning to play both the piano and guitar, but hey, a SF reference is way better.