The 24 Hours was very entertaining and exciting, but don't look behind the curtain. That nose-to-tail parity comes from a never ending series of Balance of Performance juggling where weights change, fuel capacity, refueling flow rates, turbo boosts change, not to mention aero changes affecting drag and downforce. I am sure I missed a few more paramaters.
Such things are an inherent evil in sports car racing, where the cars are the stars. I'm not a supporter of showroom stock for Nascar, a series where the drivers have always been the stars of the show. Yes, it would be great to have greater interest in the manufacturer teams, but Nascar will remain a driver's series first and foremost.
An additional point is that I see no benefit to showroom stock in Nascar as I'm not fond of 4s and 6s on an oval speedway, especially front wheel drive sedans. And the Ferraris, Ford GTs, Porsches, etc etc have no place at Darlington.