The ground loading is much higher in aircraft than with cars.
737-800
Nose 185 psi
Main 205 psi[1]
Car 30 psi
This may well make fine tread features irrelevant.
Also the width of the tyres may well be even smaller proportionately to the load reducing the volume of water to be displaced. This presumably matters too.
Wet grip would probably not be a problem if your car had 1cm wide tyres running at 200 psi even if they were slicks.
[1]
http://www.boeing.com/assets/pdf/com...ps/737sec7.pdf