This shows landing flap to be selected somewhere along Base Leg
Who flies square base legs?
At airports where bird strike risk is higher than normal, ingestion into an engine while the aircraft is in level flight at landing flap and speed, would necessitate quick footwork to maintain a safe flight path.
So what's going to happen on a low level circle at say 400ft AAL?
Fully configuring on late Downwind on a normal circuit makes sense because that's what you do on a min wx circuit, at least that's what occurs in my "Boeing", as per Boeing's guidance.