You know, there's probably an alternative reality out there where Valve actually knew how to work with third-party teams. A reality where Valve acquired Gearbox and Turtle Rock (and depending on how certain thing may of panned out, Ritual too.) A reality where Turtle Rock's vision for Left 4 Dead got to release. A reality where Borderlands was on the Source Engine and co-developed with Valve.
But no, we live in the reality where Randy Pitchford is the embodiment of a 10 gallon vat of grease and Turtle Rock is owned by the Chinese government. Why did we end up here?