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Youngs modulus is an intrinsic material property. You could find 100 types of 20mm 1m long steel bars and hang 10 kg off them and they would all deflact the same, to be clear that includes tool...

You dont have to agree, however steel has an elastic modulus of around 210GPa 7075 t6 is around 70 GPa, no where near as stiff. Your bike frame analogy is confusing section properties with material...

A couple of little points. There is a big difference in modulus of steel and aluminium, steel is much stiffer. You cant really say steel is this much stronger than aluminium, there are huge variances...