Quite a few harsh words, hehe.
Personally, I only use UE for ArchViz, so I don’t really feel affected by the privacy policy, but I totally get why game developers are frustrated 
Performance-wise, I don’t have too many complaints—aside from the occasional (or rather, frequent) crashes, of course 
That’s also why more and more people are moving away from Fab and selling their UE plugins independently on their own websites where no one can dictate how they should do things.
Though, to be fair, Fab does give your product way more visibility compared to a standalone website…
That said, UE has been serving me really well overall. And let’s not forget, it’s free while other ArchViz software isn’t exactly cheap. But as for game development? Can’t really comment, I have no clue, hehe.
Regarding the Pivot Tool, yeah, you could move the object pivot in UE4 using shortcuts, but for the kind of work I do, the nate’s plugin is pretty much irreplaceable. I work a lot with dynamic meshes, constantly rotating them across different axes, and the plugin just makes that process so much smoother along with a bunch of other useful features.