How do we know that it was Epic that locked down the configuration files? People Can Fly was a major developer on Bulletstorm and could have made said decision.
This was quite a big uproar over it when the game came out and Epic went to say something like we want the experience to be what the developer intended.
It's pretty funny how all Epic can do is make fancy tech demos and then push out console ports that look no different than 2007 games.
Meanwhile, Russian developers like 4A Games, who developed Metro 2033, already put things like Subsurface Scattering and DX11 depth of field into their game. Really, it's funny how all these big names developers just release marketing videos while the smaller developers actually release games that have these effects.
I'm thinking that Stalker 2 will have all these effects before any game from Epic does.