Not sure I like the proposal to move testing to every 2yrs.
I suppose most faults should be picked up at the annual service but as so many owners these days drive until it breaks before visiting a garage i think it a retrograde step in safety. Even those cars routinely serviced don't, generally, have their brake efficiency/balance check at service time. How many garages do a suspension check at service time, checking bushes and ball joint play etc??
The small savings in costs to the owner (which in the grand scheme of running costs generally is insignificant) could so easily be completely negated by much bigger bills come failure/accident ...