Perhaps! Then why do any societies write right to left?

I don't know the distribution of people using left or right across the world and how it is determined. It might be even close to 50% everywhere in early infancy, but once one "main direction" emerged at society level (by luck - like there were 4 people writing in that direction versus 2 in the other), maybe everybody is "pushed" in that direction.

Anyhow it's a matter of trade-offs and each society ended up with different ones - I mean direction I find least controversial, think of Chinese and Ancient Egyptian scripts that are logographic - why did they end up with that?

We can also analyze if some convention makes sense or not and why, even if the initial decision was taken for the "wrong" (or some irrational) reasons (ex: the village priest heard a voice).