> The idea that Congress shouldn't be delegating its power to regulatory agencies was a fringe one until very recently

Between about 1985 (Chevron) and 2010 (the populist movements in both parties), this idea was at its nadir of popularity. For the entire rest of US history from 1776-1980 and 2010-2025, a distrust of a large executive branch was very popular, and pretty much bipartisan most of the time. Just because you do not remember a time when this idea was popular, it does not mean that it was a fringe one only until very recently.

Congress is designed to be gridlocked. That's its natural state. We are now learning why it's a good idea to have a relatively ineffective government.

No in fact I'd say we are learning why its bad to have ineffective goverment. It lets people believe any blowhard thats claiming to be able to get things done. And its easy to do stuff when you don't care about destroying things or making things worse or following the law