Ask Lemmy

It sounds like Dairy Queen technically sells what was sold as "ice milk", since it has a lower butterfat content than "ice cream", until the federal government removed that classification in 1995:

https://www.mashed.com/1408082/what-happened-ice-milk/

The Reason Ice Milk Isn't A Thing Anymore

Many current popular frozen desserts were once categorized as ice milk and more in fast food restaurants than most people realize. According to Dairy Queen, its soft serve cannot be labeled ice cream because it only contains 5% butterfat and was called ice milk until the FDA eliminated the category. "DQ® soft serve fits into the 'reduced-fat' ice cream category and our shake mix qualifies as 'low-fat' ice cream," it states.

Dairy Queen is far from the only fast-food chain that doesn't actually carry ice cream — at least not the legal definition. The next time you order a Chick-fil-A's Icedream or McDonald's ice cream, you're eating the modern version of ice milk.

It sounds like ice milk is more prone to ice crystal formation than ice cream.

I don't know if it's possible to do a Blizzard by hand crank. Like, even if you had the same mix, it might require more-vigorous machine mixing to keep the mixture smooth.