I always viewed "road relevancy" as a by-product from packaging/power/weight/drag R&D simply increasing the understanding of the road car design and test teams.
Like F1 suspension. The sheer mechanical genius needed to simplify and lighten these systems could greatly impact the packaging and weight of a road vehicle. The hybrid control algorithms are also road relevant in the aspect of efficiency. Ducting aero is also a large contributing factor to a road cars drag numbers. All of these things that are utilized in a very specialized setting like F1 can still be very beneficial for OEMs to make safer, more efficient, lighter, less draggy, more nimble, and easier to drive road cars.
It's how you harness the data, as F1 is famous for proclaiming.