Oh my, this question opens up a huge can of worms. Why someone would want to do that is another can of worms to open, and why one would want to do that...................
I haven't noticed this handedness with my paintings except that sometimes making the mark requires some awkward motion for me or rotating the work so it's easier to do. And my manual dexterity is terrible in all directions. It's so mental. I blame my third grade writing teacher.
But, between the law of thirds and the western way of reading from left to right this can certainly result in a certain look. We have cultural and genetic makeup (handedness) biasing our paintings right from the start.
And that's before we get into what our third grade teacher did to us. Made us get a crew cut, so she couldn't pull our hair....for instance.....so maybe now we paint round squiggly people, though we hate people, because they are our third grade teacher, who we can now control with our paintings. So there Mrs Beauterus ! You don't own me!
All because I could not hold the pencil the right way, even though I am a natural righty. But no, that wasn't good enough.
Thanks for this question Murray. This has been so cathartic. I'm going to paint a rabbit now.