The main purpose of the weekly test is to make sure the system has not died. One way it might die is because of power failure over a weekend.
Davey, the FRS need all the money they can get to help pay your excessively generous pension which you are ekeing out using the amazing (and I use that word correctly) training you no doubt received in the 2nd greatest fire brigade in London. And the proposal didnt come from the FRS, so you are way off beam, like so many of the ENs your colleagues serve.
Suppers, now look here, you know I always tend to agree with you, but the test is not to confirm audibility, as you could run the sounders for only 2 seconds if you wanted. Big Al is right (statistically he had to be some time). We chucked the audibility thing in as a bit of a bonus if anyone happens to notice a problem.