fdiron,
I don't think you fylly understand the purpose of the perk system (I'm not sure anybody outside of HTC does).
One of the purposes is to keep aircraft that would be overly dominant under control. The B-29A is one such aircraft. If it were added as a freebie, there would be no reason to ever take anything else. Its fast, well armed and carries a huge payload. All other bomber, American or otherwise, would become curiosities in the MA.
BTW, there are a goodly number of historians who would not agree with your take on American bombers. Several British bombers are widely held to be up there in the top category.
Wotan,
Actually, I think you're right. Generally speaking, the more popular an aircraft is, the lower the average skill level of those who fly it in theses sims. It is simply a matter of how many non-dedicated fans of that aircraft fly it and American aircraft get a lot of that, as do British aircraft (particularly Spits). Other aircraft can reach that point too, if they perform well enough in easy to handle ways, such as the N1K2 and La-7.