That's an overly simplistic view of governance.

You're effectively says Congress should mandate every detail of every regulation. Even in areas where knowledge is changing (level of chemicals that are toxic, which medicines are useful and safe, etc).

The whole premise of our system is that the people within the system operate in good faith. And that's worked for most of 200+ years. I would posit that no amount of legislation will be able to stop bad-faith actors from screwing up the system, even more so when they convince ~50% of the voting popular that "burn it to the ground" is a reasonable take.