You say it's borderline archaic. I say trusting agents enough to not look at every single line is an abdication of ethics, safety, and engineering. You're just absolving yourself of any problems. I hope you aren't working in medical devices or else we're going to get another Therac-25. Please have some sort of ethics. You are going to kill people with your attitude.
Almost nobody works on medical devices... And some of you lucky folks might be working with mega minds everyday, but the rest of us are but shadows and dust. I trust 5.4 or 4.6 more than most developers. Through applying specific pressure using tests and prompts I force it to built better code for my silly hobby game than I ever saw in real production software. Before those models I was still on the other side of the line but the writing is on the wall.