Oversight... how can professionals overlook something so elementary?
Let me reverse that. How come what looks like 95% plus of developers manage to add it?
Are they wizards? Do they know something the minority don't? Are they putting in 120% vs the "lazy devs" minority?
Too many people are trying to extrapolate something from a small data set (games with AF issues) while conveniently ignoring the elephant in the room; the much, much larger data set of games with AF (and games that appeared to easily add it after missing it on release).
Bottom line some devs, for reasons unknown, are failing to properly add AF to the PS4 version and the console and its SDK/API clearly supports it.
To be honest though I'll leave the arguing to those that can't let it go. Case seems closed to me from what I've read publicly noted and the facts at hand.