Ain't nobody in the US got a fancy kitchen scale.
Lots of us have them. (Well, basic scales which weigh a tenth of a gram.) They're useful when weighing compressible dry ingredients like flour and brown sugar, and viscous wet ingredients like molasses and corn syrup. They're also helpful when you're multiplying a recipe by a factor that doesn't result in useful units; it's annoying to figure out how to measure out fractional cups that involve teaspoons.
They also help with portion control if you're watching calories.
Because they temporarily block the onset of puberty, not permanently block it. Any effects are mostly reversible if the individual desires. What isn't reversible are the all too frequent side effects of untreated dysphoria: death.