That's like saying bicycles encourage people to ride bicycles. It's supposed to encourage it. That's the literal purpose of a garbage disposal unit: "a device that shreds food waste into pieces small enough—generally less than 2 mm (0.079 in) in diameter—to pass through plumbing."[1]

> Some people create blockages for the entire stack or more

I don't know how that could happen since if you put something into a garbage disposal unit that can't be shredded to tiny particles, then it's the garbage disposal unit itself that will get clogged, not the pipes or drains. Whatever gets through the garbage disposal unit is going to be less than 2mm in size, and generally much smaller and liquified. If you're referring to oil or grease buildup in pipes, that is irrelevant to the use of a garbage disposal unit since people can and do pour oil or grease down the drain whether they have a garbage disposal unit or not.

In my opinion, a garbage disposal unit is an under-appreciated and supremely useful kitchen appliance, and extremely environmentally friendly (see the brief Wikipedia explanation[2]).

[1] https://en.wikipedia.org/wiki/Garbage_disposal_unit

[2] https://en.wikipedia.org/wiki/Garbage_disposal_unit#Rational...