and here George Will explains why

Our form of representative republic is far superior to any other form of government.

The constitutional structure we have is the kind progressives prefer, wherein more and more decisions are made by unelected and unaccountable executive-branch “experts” exercising vast discretion

I’m posting this from my phone so I may have missed part of the quote.  What he’s saying is that our form of government doesn’t (or shouldn’t) allow powers to be delegated to ‘experts’