Well that's the thing... synth doesn't mean digital, it means synthetic. The old electric keyboard is still synth, but at the same time, you've got analog keys, and analog manipulation of that synthetic sample via all your tweak buttons. Your cheaper keyboards are digital sure, but professional musicians don't really use the cheaper ones almost exclusively for that reason.
I know this is going to butt hurt a lot of the chip tunes kiddies out there, but they aren't "playing" stuff, they are merely activating samples via the pressing of a key. So it's guitar hero. Sure it's guitar hero with more buttons, but it's still guitar hero. I mean I've seen youtube videos of these poor, hopeless individuals "performing" in front of a massive crowd of 12 people on a modified Gameboy and they actually think they are doing something, even though the device only has two digital buttons, so they couldn't possibly be contributing anything to the playback of their samples. This, to me at least, is just an extension of that..... all form, absolutely no function.
When I see that thing, I think that somebody wasted a lot of buttons on a speak n spell that could have been put on a really nice arcade cab instead.