I believe that the MA gameplay lacks clear definition between the roles of Attack and Bomber.
The Fighter role is satisfactory, able to perform the historic duties of Air Supremacy, Escort and Point defense.
The Attack and Bomber roles naturally overlap, but the Attack planes exceed their historic capabilities in the MA and are infringing on roles typically assigned to Bombers. A clearer distinction between Bomber and Attacker targets is needed.
The ability of Attack aircraft to strafe and destroy large targets (buildings, hangers, factories, bunkers) is the major cause for the imbalance between the Attack and Bomber roles. Historically these targets were (and are now) taken out by bombs, not strafing runs. Strafing should effect AAA, unhardened fuel, unhardened ammo, barracks and GVs only.
The 1.10 Bomber enhancements are revolutionary and a large step forward imo. The net effect, however, is the reduced effectiveness of the Bomber in the MA. The current Field and Factory layouts based on the previous pinpoint bomb system need to be changed. New layouts that are "Bomber Friendly" would help balance the difficulty level and serve as incentive for would-be Buff pilots. How "friendly" is a matter of debate, but I suggest rewarding the Buff pilot able to get bombs on target. The increase of alternate bases with the larger map dilutes the damage caused by any one pilot. Bombing should effect all targets of course, but will be specially suited for large targets (buildings, hangers, factories, bunkers).
As a side note: Increased blast radius has been mentioned as another concession. I would prefer realistic blast effects on redesigned fields then an arbitrary increase in bomb blast effectiveness.
Limiting straffing effectiveness and redesigned Field/Factory layouts would help rebalance the gameplay between Attack and Bomber while maintaining their historic roles.