I understand that, but at the end of the day you're depriving yourself of a free game, a quality Mario Kart title and a great console, all because you can't talk during races. Just seems silly from my point of view. I don't get it but as you say we all prioritise different things, it has nothing to do with some people's standards being higher, as you suggested earlier.
Personally I can imagine voice chat during races to just be a chaotic mess, filled with "Who hit me!!?!?" and lots of swearing. Meh.