JSON only allowing double quotes is something I have grown to not care about, but as someone that was using JavaScript object literals before JSON became a thing, I confess I do not understand why it is an advantage? If you were at a place where it was a heavy discussion on what quote to use, I'm forced to think there were deeper cultural issues at play?

Don't get me wrong, the ubiquity of JSON speaks for itself and is the reason to use it. But, to say it has tangible benefits feels very dishonest.