Actually if you look up the specs, that 37mm gun outperformed about any tank gun anyone else had in 1939. The Brit 2lbr was equal or better. The French had a 47mm gun on the drawing board that would have been better. There were larger caliber guns on some tanks, but those were primarily HE shooters. & the US gun had a canister round .Ouch! 7 frigging machine guns (up to 9) ? That is insane! There must have been a lot of room wasted to carry enough ammo for that many machine guns. A 37mm was small at that late date.
Beyond that the engine, drivetrain, suspension, electrical, fuel system, ect.. ect... were the result of two decades of experiments and tests. The reliability of the M3 & M4 were established by the M2 development.
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