Advice on front &Rear caliphers

[PaulSmith]

The reason most people do it this way is because it is simple and it works.

Not so sure of that. 

Also with extreme heat cycles, water, dirt, salt etc, well that's the reason for the copper ease.  Brake screws have a habit of seizing up.  And as they are usually screws not bolts, you don't want damage those threads (usually a steel screw into soft aluminium)

Either you didn't read, or you didn't understand what I posted. If you actually know the difference between a bolt and a screw, then you should also know that being able to loosen the caliper easily is only a secondary objective. The primary purpose of the excercise is ensuring that it does not loosen unintentionally. When assembled as per recommended best practice, you will not have a  problem with them loosening unintentionally and you will not have a problem with siezing. Done your way, you increase the risks of seizing by encouraging corrosion by introducing copper, and you increase the risks of unintended loosening by introducing grease, so failing both objectives.