This makes no sense to my especially right now, since my sink has been backing up due to other tenants use of their disposal. A previous manager of the 200-unit building I live in instructed me that garbage does not go into the GARBAGE disposal, only gravy and remnants. (I find it disgusting to have a trash dumpster filled with garbage, which I'd think draws rodents)
I have been using garbage disposals for over 40 years, and they were always meant to grind up chunks of food, which is why they make them in 1/2 horsepower, 3/4 horsepower, and so on. You dont' need different horsepowers for gravy and small bits. Our building is likely the problem with cheap plumbing, since they build apt buildings more cheaply than they used to, for profit.
NY had them prohibited? You hear them mentioned on I Love Lucy (in NYC), which is how far back they go.