Valve "played capitalism so well they broke it" and now Steam can't be replaced
(www.gamesradar.com)
I'm wagering that Epic Games considers those things to be the things that Valve actually does right.
Which is their whole problem, they value the shittiest facet of Valve and think the 'good stuff' is where they screw up, and bemoan that Epic can't get the worst stuff going because Valve is an option in the market.