Anyway, pretty weird. I've never bought salted, but my unsalted Challenge butter is in foil with blue print. Unsure about the box, I only have one quarter stick.
Salted is worse for cooking since you want to precisely (or at least knowingly) control the amount of salt in the food. Before I met my wife I didn’t really spread butter on things like toast, and I never bought salted till we started dating and she wanted it. Blew my mind.
You are correct that that is what unsalted is for, but you are vastly overestimating how much most people care about being precise with their salt. I reckon only people who bake from scratch or make confections from scratch (and those are small fractions of the population) really take issue with the extra salt from salted butter.
Haha what a username 🙂 I only bake with butter and like using unexpected things for salt (and unami), but I will consider picking up some for the next round. My main use takes a quarter stick at a time!
I use unsalted butter and mostly keep it un-refrigerated without issue. In the summer, I do have to move it somewhere cooler. Keeping oxygen out is important.