The Pentax K-3’s big underbilled feature: Local white balance

When I first heard about this, I realised it would be a massive game changer especially for night and flashless indoor photography. But reviews have, if anything, focused on the adjustable anti-aliasing filter, and hardly even touched, much less rigorously tested, this potentially great new feature. What gives?

Ricoh promotional image demonstrating simulated multi-pattern auto white balance.