Pragmatism? Is that what he calls his ideology?
He has as much regard for established law as the Jacobins, IMHO.
I take it you have not actually read any of his legal opinions. He is one of the most respected jurists in US history for very good reason - and not the reason you think. He was on the libertarian - economic freedom end of the spectrum and certainly a central member of the Chicago school of law and economics, which also probably doesn’t mean anything to you - but it should.
Posner is the one who said that studying the Constitution is a total waste of time, that it is irrelevant to the modern era.
Good comparison