B-17 and B-29 aren't flyable probably because of the huge effort it takes create multi-engined planes with many gunner positions.
As far as the Avenger goes, I believe that 1C came to some sort of legal agreement wit Grumman that they wouldn't use their planes in-game. Perhaps Grumman has a different agreement with the developers of Warthunder, perhaps Warthunder is paying royalties to Grumman.
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