It makes more sense to me to have the back break on the right foot, in normal (not racing) riding you brake way more with the front anyway, most people are righ

It makes more sense to me to have the back break on the right foot, in normal (not racing) riding you brake way more with the front anyway, most people are right handed to having the make things stop lever be on the dominant hand makes sense. But it is just a convention, Other parts of the world used different conventions until Japanese bikes exploded onto the market and we standardised on the current status quo.