There is absolutely no inherent/physiological reason why that should be, so I suspect it may be because left-footed players are simply more visible than right footers.
And even if it should be at least partially correct, I'm sure that is down to conditioning/lazy coaching.
That is, left-footed players are so valued that they are allowed to get away with not practising with their weaker foot.
Speaking personally, I often got picked on the left for teams where I wouldn't normally have been good enough to play in the centre or down the right. This was because being left-handed, people incorrectly assumed I was also left-footed (I'm left-handed/right footed, an unusual but by no means unique combination).
Anyhow, being left-handed, I was never scared of trying to kick with my "wrong" (left) foot, so that eventually I became near equally proficient/useless with both!
Consequently, if I was coaching young kids, I would actually ban them from using their "good" foot until their weaker foot improved.
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