I already have two AC adapters so this is not a problem for me, yet I'm not cool with this decision.
I'm purchasing a N3DS XL regardless, but I don't want this to set a bad precedent somehow. When I first heard other regions didn't get chargers I was baffled, I didn't understand why you would leave that out since it's essential to the console. At the time I also didn't think Nintendo would try to pull that in the Americas and now they have, so just like I complained during Driveclub's PS+ offer ($50 for PS+ users, will not keep full game if subscription expires, later fixed), I'm complaining here because I don't want this kind of precedent to be left.
I also think people don't have any 3DS console and planned to get this one but won't get it anymore due to the lack of an AC adapter, are being way too hard on this. Sure, it's an inconvenience and you'll have to spend a little more, but you already planned to purchase the console and while I think you have all the right to complain just as I'm doing, don't let this be the reason you won't be getting a console you wanted to get.