There’s a lot of misunderstanding around this stuff. Technically all you need for a bomb is the ability to go prompt critical on demand which you can do at surprisingly low enrichment levels. What’s a useful weapons grade enrichment to you has a lot to do with your delivery systems not some universal constant. If you’re looking to fit something in a WWII bomber or early generation ICBM that imposes specific limitations.
And yes, in an alternative universe where delivery systems also just appear out of nowhere, you could sprinkle a million tons of 1% uranium over a city.
You can buy a used A380 for a few 10’s of millions. Convert that to a drone is fairly cheap, and you end up with a deleverage system vastly cheaper than the cost of producing a nuclear bomb.
Obviously a subsonic aircraft isn’t ideal, but historic ICBM’s ended up being designed for multiple bombs that’s a lot of leeway if you use the same system to deliver a single bomb. What the US considered weapons grade in the 40’s through the Cold War is based on assumptions that simply don’t apply here.
Reduced fat milk is often specifically referring to 2% milk, but 1% milk is also reduced fat milk.