The outnumbered play smart and there is no issue. In fact, the outnumbered get better action.
The game provides many effective tactics that the outnumbered can use to deter the side with numbers.
It simply boils down to willingness to adjust. Far as I am concerned the numbers hordes are just bigger herds and make for better culling.
The outnumbered get to fly light and interdict except for when they are on barracks busting hops. But a substantial number of the attackers have to come heavy.
Problems I usually see where the defender gives away the advantage is when defenders are slow to scramble, and when defenders settle for chasing low around their field instead of forcing the fight away from the field and at the nme flight path, like when you see 6 guys chasing 1 low nme instead of the other 5 grabbin.
Defenders in light fighters can grab alt faster, and if they get above the incoming heavy fighters they can bounce em and at least force them to jettison ord, and mix it up away from their field.
Outnumbered side can up 262s, and while they are a real sloppy ride in ah2 they nonetheless can hunt low where goons normally travel and have speed to survive low if one maintains a watchful eye.
So, those who care or take some pride in stopping the attacker have many effective tactics. Only issue is whether the outnumbered give a *** about it.
NO TRUCES.