In europe almost all toilets have flush button in the middle of the tank

Both my toilets have the flushing thing on the right side.

One oddity for me at least: I'm left handed, but right eye dominant; which means I aim a gun or draw a bow with my right hand, to line up with my right eye.

Yeah, I used scissors as a main tool in my manufacturing job that I had nearly a decade, ..many tools are right handed. Even driving a stick shift is right handed work.

You adapt.