Before I even give thoughts on what this JA could do, I just have to share my reaction to the JA translating to "God in the machine" with you all...
(minus the confession part. >.>)
That out of the way, I think we can all agree that the hindering factor of using this effect could be any or all of the following.
-Automaton is summoned with reduced HP/MP
-Automaton could be activated with no attachments.
-Automaton will be activated Overloaded/Burden at max.
Another effect could be that it's activated into a random frame; stripping all attachments. Can't wait to see!