P types, who are response-ready, naturally understand freedom as the absence of constraint. They want the ability to take immediate action, as a situation is occurring, without having to explain it to themselves or reckon with prior limits.
J types understand freedom from the opposite perspective. Without plans or expectations, one has no choice but to be response-ready, constantly alert to all the data available in a situation. This lack of choice makes J types feel trapped. It forces them to react, and only to react, without recourse.
From this point of view, the ability to establish priorities doesn't limit one's options. It creates options that don't exist in nature, thus freeing one from the mercy of chance and circumstance.