Yes, as a good example, even the Ferrari F50 didn’t have a racing-style diffuser, though it did have cutouts. That and circular exhaust tips would make it feel more accurate for the era.
(Sidenote, that blue hatchback looks great)
This thing looks way better after your facelift. The yellow-on-green livery clearly makes it stand out from the crowd, which it was meant to do. But regardless of what lies under its rear deck, it’s guaranteed to be very fast across the ground - especially at a circuit.