We'll see how it goes—if enough folks complain, we can revisit :). I wanted the content to be in the absolute forefront with this update. That meant not affixing the top navbar and downplaying the side nav. I think it's super helpful, but again, I'm open to reversing things again if it'd be better for more folks.
I like the links on the right, but I think the main navbar should be affixed. Having to scroll all the way up to get back to it is a pain, especially on the longer pages.
That's not really an argument, and that isn't standard navigation to begin with. It's for in-page links and the links highlight as you scroll. I would argue that it's perfectly intuitive.