And, for once, it should be enforced
I've spent the last six months sat next to a DSP engineer who was writing code to measure the average levels on transmissions and adjust the gain to ensure the ads aren't too loud.
Sometimes, encoder manufacturers get things right.
 "Average" is actually quote hard to define; each advert is a separate item, and the repeats between adverts are their own thing. But the overall result of Huw's work seems to be a good thing.