The automotive industry certainly has far more resources at it's finger tips than any RV manufacturer.
If disc brakes were not superior, why have so many auto manufacturers gone to them?
The bottom line is that they are very superior, especially to electric brakes.
If you consider how many things can go wrong with electric brakes over the disc brakes, the disc brake systems will win that argument , hands down, every time.
Then when you consider the cost of repairs, again the discs win, every time.
Anything that's made by man, can fail. It's the failure rate that becomes the key. Disc brakes, simply because of fewer parts, have a far less failure rate than electric brakes.
Finished diamonds can crack. And the kids we men make? Another story.
The key words are "proper and routine care", just like we do for kids. That does not gaurantee zero failure, but it does reduce the probability.