If you possibly can, take most of my replies here as being my personal opinion, and not an official statement from Trimble. I’ve used SketchUp since version 3, and I’m a Sage in the forum, and although I sometimes am able to give answers that would be difficult to give if you didn’t work in support at SketchUp, I often just join in conversations for the fun of it. It would be a shame if I could only ever post here after running things by the Trimble lawyers.
I wish I had the time to list all of the new features for each release, it would be an interesting thing to look at. Even version 1 had most of the tools in there, but early on the updates may well have introduced new tools, and the later updates try to improve how the tools work. That may then look like less things were new. It would be nice if there was a tool type that nobody had thought of so far, that could be added in the next update. Maybe that would then look like more was new.