many of us are masters of form and dialect. we are shape-shifters and chameleons. we ourselves are often in between one form and the next, shedding old skins and growing new ones.
j takes in new information too, it is just more directed and focused. j focuses and p does the opposite. haven't we figured this out? this is what judging is, pairing down to a verdict, weighing, etc. we do this externally vs internally, watch the results/outcomes present all around us, etc.
but yes Je/extraverted judging probably does have more desire to harmonize and mobilize, commune and conquer. so there is that. march! it likes to connect with the world outside of itself, to merge, to blend its will with that of the world. and as such it IS more OUTWARDLY judgmental. but it can listen too and admit when it is wrong, when it needs help, when it needs to give in and move on to something new, better, more pure. when it itself needs to change.