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Folding bicycles often break or fold in the middle of the frame, which depending on the design, can weaken the frame and cause more energy absorbing flexing.
Folding bicycles often have seat posts and steerer tubes which are elongated causing larger bending stresses where the tubes meet the frame. There has been atleast one recall, Birdy, due the failure of the steering mechanism.
Folding bicycles universally have many more parts, to allow folding and lock the frame when unfolded. This results in a much more complicated design, with more parts that can fail.
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