NASCAR is a trainwreck, now. The stages & "playoff" system is dumb AF, IMO.
And as far as "stock cars" go, remember when it was all sedans? You had to have a sedan in your lineup to race. "Mustangs", "Camaros", etc were never a part of the series for decades for a reason.
If you're a non-racing car guy, you'll remember the Dodge Daytona & Plymouth Superbird from 1970. The whole reason that car exists because OEMs had to sell at least 500 units of a model for it to be allowed to be raced. This is because they were actually racing (versions of) what you were buying off the showroom floor.
If everyone is (more or less) gonna have the same chassis, engine, etc, why even have OEMs in the first place? It's basically just IROC at that point.
I'd much rather watch something like Australian V8 Supercars or something like that - at least then there's a distinction.