They were so focused on setting up a system that would allow for power hungry politicians to compete, it never occurred to them that legislatures would make so much in salary and grift that they would prefer to not exercise power and instead just campaign. My favorite was the democrat representative from Texas during Trump's first term that complained about them prosecuting marijuana dealers, but never even bothered to sponsor a bill, even a garbage, unworkable in practice, "Marijuana is no longer illegal" half a page bill with no references to existing statutes. Just bitched about the executive enforcing the law that he was too lazy to even pretend to try to change.
I mean, the capitulation happened along time ago, it's just been getting more an dmore obvious. Limiting Chevron deference it least limits the executive to stuff more likely to be contemplated by the people originally enacting the law and forces the legislative branch to actually legislate if they want to make major changes to the law.