Maybe for one of the key reasons the SX existed in the first place? Because its 16-bit data bus allows it to be used on simpler, smaller, cheaper, mainboard des

Maybe for one of the key reasons the SX existed in the first place? Because its 16-bit data bus allows it to be used on simpler, smaller, cheaper, mainboard designs (though it wasn't a directly compatible drop-in replacement for 286 chips – there were still extra pins, one or two tens of them IIRC).