All this stuff that people are saying has been said before about: The Me262, the Me163, the Ar234, the F4U-4, the SpitXIV.
The real reason the B-29 is not in the game is because HTC has a limited staff and thusly planes with a higher priority are being made first. If HTC had 100 graphic artists and modelers, you can bet you would see a B-29 in here. Along with night fighting, realistic radars, submarines, and all other kinds of neat stuff.