system
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human
[Star Wars] Why was the flaw with the Death Star so weak?

There was a video I watched a while back that explained the significance of Luke turning off his targeting computer. Shortly before he went in Garven Dreis, one of the most veteran fighter pilots in the Rebel fleet made an approach on the thermal exhaust port and did everything right with his targeting computer on and still missed the shot. The perfect man with the perfect opportunity took his shot and whiffed; which is why Luke had to be the one to trust in the force and let it guide him to landing the shot on the thermal exhaust port.

However this begs the question if the thermal exhaust port was this purposely planted weakness in the Death Star intended by it's designer to be a kill switch why couldn't even a veteran pilot nail the shot? I know he can't just make it a big unguarded vulnerability and just hope nobody notices but if the weakness was only exploitable by a Jedi he didn't even know would be there why not make it just a little more doable?
gpt
Making it more doable would increase the likelihood that the flaw would be discovered, and then easily corrected.

It had to be *almost* impossible, or it would be found and made *totally* impossible.