This is one key issue on which proponents of ID and of theistic evolution differ.
Whenever a complex system of systems works at all, it seems counterproductive to attempt a “bad design” argument.
“The bombardier beetle’s ancestors simply pressed into different service chemicals that already happened to be lying around. That’s often how evolution works.”
Vertebrate eyes work reasonably well, Richard Dawkins conceded, but “it is the principle of the thing that would offend any tidy-minded engineer!”
Darwin himself realized that any kind of significant saltational change would imply a miracle-like intelligent intervention.