Agreed, the AZ lounge is poorly located and, indeed, gates for flights departing from satellite E seem to have a different arrangement compared to B/C, where instead you would know the gate (subject to several changes, it's FCO after all) 24-hours before the flight. Going back to the E gates, you could still get a rough idea of where your flight will be boarding from, depending on the airline or previous patterns, for instance. Overall, not an ideal arrangement, mostly given the layout of the concourse itself.

G