Thats the trouble with more and more manufacturers, they EXPECT us to have the stuff to be able to run what we are buying, same for the NES Mini etc, but at least in that case that came with a hdmi cable.
But come on, them selling thousands it would cost only pennies to add them, sign of things to come? sure, am i bothered? yeah could sway me to not buy one now.
Neo Geo was a sign of luxury, this product has no battery, no cables and no joypad for 2 player, heck you even have to put the decals on yourself, far from the luxery look, even the Neo Geo X looked and was packaged better than this (emulation not withstanding).