Yea i know they are but they're also the last teir of tire with realistic grip.
I'd driven on full slicks on the road IRL... and i'm not the only person I've seen do that.
I have to second the road car = no slicks. Slicks are illegal in the US on public roads (I believe in the UK and just about everywhere else as well, as a car with slicks becomes dangerous to everyone around it if it starts raining), so your car is no longer a "road car," and thus when talking about a "road car" it is usually a car that can still be reasonably driven on a public road. Whether that is enforced or not in your area is a separate issue.
The term does have room for interpretation as there is no set definition, but I think something that makes it illegal almost everywhere disqualifies it from being a "road car." If you take a fully race prepped car for a spin around the block, it doesn't make it a road car just because you drove it on the road.