It's certainly a bit of personal preference, but the MK game inputs just tend to work a bit better on a pad than a stick. Netherrealm has also clearly focused on making those games work well on just a standard controller.
MK doesn't have much in the way of complex directional inputs (dragon punches, quarter/half/full circle) where you might get more benefit from a stick, so it's often easier and faster to just tap out the directions on a pad.
Having block on a trigger also seems preferable to having it on a fightstick button.
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