Well, they can, but the cost will get more volatile… super oversimplified, it’s the difference between drinking at home booze you bought at wholesale prices and keeping a running tab with a local bar/pub. You’ll be subject to the bar and any price changes they (read: the currency markets) want to make.
So glad the Europeans finally broke Apple and their ridiculous charger shenanigans. A coworker just got a new iPhone and asked me if I had an iPhone charger, I told them no all Ive got is USB C. They said they didn’t know what they had and showed me the bottom of their phone and, sure enough, it’s USB C. They had no idea that only Apple kept making their own charge connector and that basically everyone else had settled on one charger/data port like two or three standards ago.