"You just like to argue. :B" Ya got me. lol
It does look and sound easy, but I still don't know that I would care to plumb into my brake system for a trailer brake controller. And since they never really caught on, I may not be the only person feeling that way.
Perhaps it wasn't lazy or inept people, but rather people who didn't think adding an afermarket brake controller to their hydraulic braking system was a good idea.
Considering the number of people who will spend hours adding gizmos to their cars/trucks with almost no benefit, I can't see that inability or laziness is the reason that Maxbrake is no more.