Localized parts are really a thing for electronics. (See keyboards)
I know Dell offers optional cell capabilities in some models. Just like the heated steering wheel in a car, this usually is an option you want to get at purchase. Expansion slots can offer the same capabilities.
That was their second reaction to it as well. They are well behaved though. Once we made clear it was not for mauling and destroying, they seem to be fine.
Great read.