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CellJeffe
However, the design does have the advantage of only 3 motors for full X-Y
I know of more 3 motor cartesians than 4 motor, where are you grabbing this information? I've got a 3 motor cart. myself and have no issue related to not enough motors.
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CellJeffe
The other advantage is that with a much lighter Z axis, it can use belts or even rack and pinion drive on the Z axis instead of lead screws. A lighter Z-axis is less likely to fall down and go boom upon power loss.
Don't see how it's lighter than other options are possible with, but I also can't recall a single event where a bed has fallen on power loss, belt and especially not screw.