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Although R's or slicks do not have a lot of grooves showing like your street tires do --there is usually 2/32 to 4 or 5/32nds of "rubber" still there.
When an R compound DOT approved tire or a true racing slick is worn down to the point your tires are now --they do not grip well either and will slide around like your car is on glass. The Rubber is still what grips the road (or dirt or whatever) ---not having grooves or "tread" just give more contact patch and less opportunity for the tread blocks to move around and overheat the surrounding rubber or chunk off.
the grooves or tread blocks are there to evacuate water, snow, dirt or whatever --different tread patterns for different types of driving environments.
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