Do you not have to weigh your stuff before going to the counter?
That's how it works in my country, we have weighing stations where you go and weigh your things yourself, and get a barcode sticker. Then you can either go to self-checkout or the cashier, who doesn't need to waste other people's time by weighing your stuff as well.
None of the stores where I live now do that. If the produce has a numbered sku sticker on it, you could just punch in the 4 numbers but if there's no sticker anywhere on your apples or something, you have to look them up and make sure you hit the right one because there are a lot of different types of apples and pears and whatnot. A cashier generally knows the product number by memory or can find it superfast.