Although PC ports have done quite well for the company in recent years, Sony's reportedly decided to pull back on their frequency, at least for big single-player games. To what end is unclear – there weren't all that many to start with – but a former higher-up from the corporation doesn't see the logic here, because the games were finding players they would never have otherwise.
On the PSI podcast (via VGC), Shawn Layden, former chairman of Sony Interactive Entertainment Worldwide Studios, explains he can't quite wrap his head around Sony seemingly pushing away the PC audience.