Yep. And even a world of perfect good faith, "forgiving in what you receive" has both costs and scaling problems - from researching what "spec" you'll need to

Yep. And even a world of perfect good faith, "forgiving in what you receive" has both costs and scaling problems - from researching what "spec" you'll need to design to, to customer service when the added complexity and permissiveness cause interesting stuff to happen.