The only way to get Honda to even consider replacing the unit to to allow the techs to do their job, no matter how limited it is. Some dealers have a 1 hour minimum for ANY diagnostics, some 30 minutes. One area going to a different dealer may help. They certainly do it for free! People have to eat & pay their bills & freebies mean less paycheck to do that with.
!00% of the replaced units in & out of warranty were checked by a tech. You are refusing to allow that by not agreeing to their price. So that puts the responsibility on YOU, not them.
I have try to explain the procedure. It won't change whether or not we agree with it. The only hope of having Honda find the flaw is for them to get the bad units, the way this happens is to have them replaced.
You are mistaking "Honda's" treatment of customers with the "dealers" treatment of customers. Honda says they will only replace things under warrany. Dealers have managed to talk them into it. That's not unequal treatment. That's unequal brains of the employees.....