My observation is based on the features of both models, user adjustable options they both have and the simple fact that they are produced by the same company. I don't think anyone else would share your opinion about this being a revamped numark X7.
No, not 5-pin MIDI input - recieve midi bpm through usb. That way, you can use DJ software, have mixers FX's synced to the track bpm (currently possible with previous Denon mixers) and add & sync external hardware through the existing 5-pin MIDI out port on the mixer.
X1800 lacks midi in option because they designed it for SeratoDJ - that doesn't have the option to send track bpm via midi through usb. It's currently unknown will this mixer's FX's be synced to SDJ's bpm through some native communication protocol (SDJ sending Engine Link data?), we'll have to wait for SDJ certification in SDJ 2.0 version (currently in beta).
At least two users reported. Audio still plays, no control responds. A big no no in my book.
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