Oh, it’s even worse, try to get any answer regarding Navisworks API (I mean serious answer to serious question), you will not have any. I’ve found a few serious errors (like one related to changing color and opacity), answer has never came. In order to get a lot of things done, I’ve developed my own plugin for different reporting tasks - and it’s a larger workflow change than anything for the past 6 year in the Navisworks (and I’m a single developer, working from time to time on that).
But, there is a number of new projects not using Navisworks (or any Autodesk product) for BIM, so I hope Autodesk will notice decrement in daily users.