Carmack speaks (k3nshi)

Carmack:

Like Prey, there's a lesson to be learned, something a lot of companies don't really ever learn. You hear it from the fan base a lot. "Do it right. We'll still be here. We'll wait," and it's tempting to just let things slip. But that's really not OK. If you're doing something cutting edge, you're making fundamental decisions about your architecture, and if you let it slide for a year or two, then it's just not the right decision anymore. Even if you pile on all these extras, it's not optimal. It's not targeted at what you're doing. So I have some concerns about Prey coming out this late.

Source