I can imagine a person writing a B using their right hand moving left to right. To me (maybe in hindsight and biased) it seems more natural to write B that way.

I can imagine a person writing a B using their right hand moving left to right. To me (maybe in hindsight and biased) it seems more natural to write B that way. But there may be cultures who write B but write right to left or both ways boustrophedonically "as the ox plows" like ancient Greeks did. My reasoning is once the vertical line part is drawn it would be awkward to go backward for the two bumps. Especially if using ink not chilling it into stone. You would end up smearing the ink. But even with stone or ink you'd have more room on the right for spacing between the previous and next letter.