I'd love to see a source, I have literally never had the internal flap break and I must have had at least 30-40 devices pass through my hands with USB C by now

Everything from a cheap Chinese brand wireless mouse up to my main phones (which are constantly plugged in and out) to all the random laptops, tablets, Xbox controllers and other peripherals in between.

It's never happened, though crud does build up in my phone port after a year or 2 to the point that I have to clean it out, but that's nothing but a small paper clip and 5 minutes