Tim Harford re-phrasing of the question:

Is it progressive to attack the very existence of mainstream economics?

is answered emphatically “No” by Simon Wren-Lewis in On criticising the existence of mainstream economics. Much of this “no” hinges on the premise that economics is a science, as well as a pretty thorough misunderstanding of the basis of political power. Put another way more briefly in reply to Mr. Harford’s re-phrasing:

yes, we absolutely should abdicate all policy decisions to an...