ORIGINAL: Skritshell
With such a high number of Bombers joining a battle the Soviet ground elements were always disrupted by 20-30% minimum by air(even in winter). This creates a situation were in order for a Soviet player to have any hope of a successful attack they MUST fly their own planes in retaliation when on the offence(god can not help a Soviet who leaves GS on when it is the axis turn, the will quickly lose 3k+ planes), thus suffering the above mentioned loss ratio
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Skrit
The point you make here I think is a general problem with the game engine. Start a 1941 scenario and the Soviet air force loses huge numbers. It appears at first sight that we don't need to question this - the historical attacks on the airbases are the cause, but careful examination of the air doctrines shows the Germans do not have a doctrine to bomb airbases and no air directives are set-up by the AI to bomb the airbases, and no reports of such bombings come back after the air phase.
If you manually control the air directives and set-up bombing missions then you get the reports of planes destroyed on the ground, and this can be extensive especially if a base is not heavily protected by AA. However, the biggest losses of Soviet planes are if the bombing missions are intercepted. 40 Soviet fighters can intercept 40 bombers with 20 escorts and the whole of the 40 Soviet fighters get shot down. This is wholly unrealistic. There is no evidence that the German planes and pilots enjoyed that level of superiority in the air, the massive losses of the Soviet air force were the result of the surprise attacks and catching so many planes lined up on the ground not in dispersed and protected situations.
What you find by experimenting with the air directives is that it hardly seems worthwhile to change them and set-up all of the airbase bombing missions. It's alot of effort with no obvious benefit. Just leave your planes on ground support missions. Then when your combat units attack, the Soviet airforce will send out squadrons to intercept and they will be wiped out in the air. Overall, this results in almost exactly the same Soviet losses on turn 1 as the deliberate attacks on their airbases would. And potentially can result in lower German losses because the frontline Soviet ground units are not equipped with much heavy AA, compared to the losses from certain airbases which are.
I am unsure if this is a bug which has not been identified in testing of the game, or it is deliberately setup in this way to provide the superficial result that the Soviets can suffer 10-1 or even as high as 20-1 losses early in the 1941 scenarios. But this is then being carried through the whole game.
It seems to me that the balance is wrong - squadrons which are "defeated" in an air battle should be able to withdraw from combat after sustaining a certain amount of losses, not fight to have every single plane shot down. It is also possible that the German planes are just massively OP. The turn 1 situation for Barbarossa just needs a special rule to account for the surprise element, such as making the effects of the bombing higher and reducing the effects of AA. Possibly even make it that the Soviets cannot launch any interception missions on turn 1.
There should be an advantage to a human player to actually make the effort to plan at the start of the scenarios in 1941 to carry out bombing of all of the airbases, currently there is not. And the effect that the Soviet airforce is wiped out comes more from the disruption that occurs when the Axis forces advance and capture the airbases. Squadrons which are not already moved from the airbases on the front before the hex is captured, cannot be destroyed, but the pilots all jump in their planes and fly off, and the squadron is forced into the reserve and therefore won't return on the map for several turns. Once they do, they will come back to new bases with very little supplies/support and rinse/repeat as they fly missions at a severe disadvantage. And I am not arguing against that gameplay mechanic, just pointing out that it hides that when the Soviet squadrons meet German squadrons in the air the typical result is often complete annihilation of the Soviets with hardly any losses for the Germans.
So, if the Germans have the increased capacity in this scenario to replace all of their (small) losses, then they will easily maintain their numbers of planes. As you suggest, the Soviet player might be better off not engaging in intercepting German ground support missions, indeed may even be better off just parking their whole airforce at some remote airbases well away from the front and carrying out no air directives, to avoid the VPs given to the Germans from their losses. They will still gain almost as many VPs from German losses just because of AA and operational losses as they can ever hope to inflict by actually flying missions.