Then maybe refrain from talking about it...
The RF2 model requires the material data and exact construction of the tire. No one except people high-up within the ranks of tire manufacturers has access to that data, S397 included. Especially for the tires of a car based on LMP1/LMP2/GTE/GTLM regulations - Michelin doesn't even let the real teams take those tires back to their shops. No one knows, or is allowed to know, their material construction besides Michelin.
Furthermore, if you have force, slip angle, slip ratio, relaxation length, etc measurements from a real tire, they don't particularly help you in RF2. If your model doesn't match the data, then what? Arbitrarily guess which of the numerous material properties is wrong? Even if you do have the extensive information required for an RF2 model, you're still assuming its model correctly represents the real physical interaction between a tire and the road, which is a very hefty assumption to be making (tire manufacturers are constantly working to get their models to be representative - think of how obscenely unlikely it is for a small game studio to have bested them).
So, moving to RF2 would absolutely be a step rearwards in terms of accuracy, and that's just in regard to the tires. The Patch's aero model is more advanced than RF2's, so are its brakes, so is its traction control, so is its suspension, so are its graphics. Feel free to disagree with that sentiment, but bear in mind that you'd be going against the viewpoint of people (not just myself) with much more experience.
To all, please no more posting about it in this thread - it's not the place.