Just bombing and recon? That is huge and was a massive part of Soviet breakthrough ability. Now I don't know if we're saying the Soviets lack LL or the ability to Cash and Carry ITTL or if that would reach OTL amounts of supplies and equipment coming in (probably nothing from the British except via Canada and maybe Iran ITTL, certainly not via Murmansk for a variety of reasons), but they'd be in a tough spot without all that OTL stuff, especially trucks and electronics, which enabled Soviet rapid advance in 1943-45. Back to the Luftwaffe issue, it isn't just aircraft, though you're WAAAY underestimating the power of having quadruple the number of fighters and 900% more twin engine fighters, as well as the impact of a specialized air force for the Eastern Front, rather than one set up to fight three different types of air wars IOTL (low altitude, high altitude, and night strategic defense fighting against the Wallies with their superior electronic equipment). It is also that the Luftwaffe ran the AAA, which was 80% against the Wallies by 1943, and could have been used in the East, especially as it consumed 1/3rd of all German ammo production during the war (including small arms, naval use, artillery, bombs, etc.) I've seen one estimate that the Germans could have doubled their artillery park without having to defend against the strategic air war and that was without even factoring in the economic limitations caused by the Wallied blockade of Europe.
Without having to put their best fighters in the west instead of using Stukas the Germans could use fighter-bombers with rockets, cluster bombs (SD-1, -2, -4, and -10) and probably napalm (they used something very similar in 1939-1941 and in the Spanish Civil War, but the fuel crunch stop it's usage). Having that would also free up He111s and Ju88s/188s/288s(?)/388s to bomb Soviet factories, which they largely stopped by the time Kursk happened due to pressing all level bombers into close air support, which got them killed and damaged very easily. Still the biggest problem for Luftwaffe bombers and CAS was Soviet fighters, which had largely free reign after Kursk due to the shift west of the vast majority of fighters and fighter pilots from then on. By 1944 there was virtually no ability to conduct aerial recon due to the Soviet fighter threat and lack of fighter escort for the Luftwaffe as they had pretty much been killed in 1943-44 in the West.
I'd suggest reading about the air attacks the Luftwaffe made during Kursk, which were extremely helpful for the Germans (contributing to their 3:1 casualty ratio in men and something like 8:1 in armor) and never again were able to be conducted like that due to the demands and losses in the West.