The current system is fine if people understand the number and weight limits. The number makes no accommodations for children and is what you’re going to get cited for, not the weight.
I don’t want the number tag on my boat reduced from 4, which is perfectly reasonable with my wife and I who are in shape, and our 2 young kids, just because you shouldn’t put 4 330 lb corn fed country boys on it.
It’s up to people to do their research and dealers to not gloss over capacity ratings and just focus on numbers. I’d be curious to hear if anyone has ever been ticketed for being overweight but not exceeding the number of persons.