Should there be a law

who cares. use what ya have

Exactly. Not everyone has the deep pockets it takes to build a Mopar motor. And then is also the case that often times the other makers offer a product that suits someones needs better. Case in point...auto od. 4l80e can take a butt load of power and still have od and lockup.
Some folks areally just to narrow minded to see the truth...

It is what hot rodding is all about...