In fact, the attack aircraft of this era all place a high emphasis on low altitude performance.
Representatively, besides the Newland Navy's A-6, there's the Liangxia Navy's "Attack-5", as well as the West Continent Group's "Jaguar" and "Storm" IDS, among others.
These attack aircraft all have excellent low-altitude stability, and their methods of achieving this are quite similar.
Simply put, it's high wing load.
Although high wing load reduces maneuverability, making the aircraft more cumbersome, correspondingly, the heavier the aircraft, the better the stability during low altitude flight.
It's based on this aspect that the A-6D possesses outstanding low-altitude stability.
