IRL, I've always RFB, even at a young age with automatic tranny hand-me-down vehicles. That is the way you are suppose to do it as taught. I of course have had a clutch ever since I purchased my own vehicle just out of high school.
I bought my first PC wheel controller in 1996 and it was just perfectly natural to LFB, even though I had never done it in a real vehicle. I guess it is just from the spacing of the pedals as I haven't seen an inexpensive pedal set that had spacing to allow RFB.
If I LFB in a real car, I can quite possibly hurt myself with the stuff in the back seat flying up front into me, LOL. If I RFB on the PC, then I have no control and lock them up. It's weird.