Bought one here in Australia on launch day a while back. No AC adapter here either. I mean I had one for my original 3DS, but yeah fuck Nintendo hard. They did this with the 3DS XL here too.
When I bought a Game Boy in the 90s and a Gameboy Color, I had to buy batteries. So I don't really mind buying a $5 charger. It just doesn't bother me.
Replaceable AA batteries vs propriety lithium-ion batteries. Not really the same thing at all.