Zimri said:
You're right that is what I'm going for because I've had the knock out drag down fights about how exactly is (for instance) a human monks fist not natural even though it is stated that it counts as both a natural and manufactured weapon. The sides won't meet and I've accepted that.
I'd look at it from a game balance point of view. Let's say that I'm the DM and in my world, with the types of challenges faced and the types of opponents faced, I think the monk is going to be very useful without Improved Natural Attack. I'd just tell the player "Well, it can be interpreted either way, so it's a judgment call. I don't think you're going to need that edge in this game, so I'm ruling against it."
If I thought my particular game was such that the monk would be underpowered, I'd tell the player, "Well, it can be interpreted either way, but I think the monk could do with a bit of a boost, so you can use the feat."
And that should be the end of it. The DM rules based on what is best for his game. No legalistic arguments about the wording. No appeals to what was printed in Sage Advice.
Similarly for the lance "1-handed or 2-handed" argument. If I want the visual of a cavalry charge to be knights with shields on the left arm and lances couched in the right, then I have to give the lance the benefit of a 2-handed weapon when used mounted in one hand. Otherwise, the standard visual is a much less effective manner of attack than carrying the lance in 2 hands. So in the interests of my game, I rule accordingly, and just ignore the semantic debates.