I hear what your saying. I should mention that I am a mechanical engineer. And to directly address your original post. Your concerned that it’s not clear that the part is designed to appropriately handle the loads or that conditions may change and it may no longer work properly.

The part design can only be robust enough to handle the conditions it is designed for. Getting the right requirements is the first step of the design process. If the requirements change the part would need to be totally re evaluated. This would be true wether it’s designed traditionally or not.

Both methods evaluate the part in the same way. The same simulation of the part would be done (fea). I don’t see any point where the engineer would not be sure if the part can withstand load conditions given. There’s no hidden magic.

TL/DR Wether it’s an organic shape or traditional design. They are evaluated for suitability/ strength the same way. And in both cases the design is only as good as the requirements given. If requirements change, designs always need to be re-evaluated no matter the method the geometry was formed.