Subframe deformation is not normal, but as all here have noted, may have multiple contributing causes. But maybe it's not the subframe's fault.
I can envision the spring rates being too low (either by specification or manufacture) so that they compress under load more than they should. Then when the suspension bottoms out the weight of the load is transferred to the subframe which is not meant to bear the dynamic load continually or directly, because that's the job of the springs and shocks. In this example, whether the subframe is defective or under-designed is open to argument.
Or look at it another way. Maybe the max load capability for the vehicle has been misstated. If that is the case, owners could be unknowingly overloading vehicles. Seems equally possible to me.
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