FB on the left... is it a US thing?

Owned more street and MX bikes than I can remember and it's never even crossed my mind to think about which hand or foot is doing what when going between riding something with pedals or an engine. Thinking about it would cause problems.

If anything, you need almost as much sensitivity and control with your left hand as the right if you have a background on motorcycles since the clutch isn't an on-off switch like a lot of people tend to treat it as.