hMonkeyI'm not going to sift through that video, but I'll take your word for it. Maybe I am fortunate, because I am approaching 5 years of using Houdini, and I have not experienced any issues whatsoever with viewport navigation.
I don’t remember which part, but it’s peppered through out the video, basically pivot around cursor is imprecise and wonky at times, and occasionally you have to wrestle with pan and zoom, all that falls under the viewport issues category.
It works very well and exactly as expected/advertised. I am able to navigate very tight spaces very cleanly - the tumbling/dollying around cursor is very precise - the double-click to close-up works great - framing components all good - even the temporary override to use the view center as the navigation pivot is nice.