How could the screen resolution be too low? The original Neo Geo was low res, so it must be higher than that. I don't know why changed the aspect ratio, I suppose they had a 16:9 screen (as for economic reasons it had to be, no company is making 4:3 screens any more), and then they thought the image should take up the whole screen. But they could have at least given the option to change to 4:3.
I kind of liked the dock for the Neo Geo X, the way it was a replica of the original AES console.
The ideal screen for the Neo Geo X would have been one with RGB connection, arcade scanlines, and being OLED as well. But I don't know how likely that would be. I don't know which type of internal video connection the Neo Geo X and Neo Geo Mini have- whether it's RGB, or something else.