It is like saying, if you tape the trigger safety down on the Glock and drop it can go off, therefore it is a design defect.
I'm used to the kind of engineering where the goal is not to kill people I guess...
A trigger safety is meant to ensure that the trigger must be intentionally pulled (as opposed to moving during an impact) for the firing pin to be able to release and hit cartridge primer.
The 1911 famously has a grip safety, which needs to be depressed for the trigger to move. This is to try to ensure someone has to be gripping it with intent to fire, for it to be able to do so. While much safer than other pistols at the time, 100+ years later the design is relatively flawed, and isn’t truly drop safe, as the firing pin can still move.
Sig has good engineering videos where they walk through many of the mechanisms on the M17/18/320.