It's about
horsepower. You need more horsepower and higher RPMs to blow the stuff out of there before it collects and globs into a clog.
Think about horsepower and RPMs instead of ruling out 99.5% of the things you need to dispose of instead of having it rot and stink in the wastebasket or trash can.
Most contractor-grade garbage disposals don't have much horsepower. Once a knowing plumber told me this it made all the sense in the world, and we've had no problems since getting one of these formerly called the Bone Crusher:
Waste King Sinkmaster garbage disposals, food waste disposers