This may be an unpopular sentiment, but here goes. The hyperbole over this kind of reasoning threatens the very fabric of the Web. Snowden did the world a service in revealing all of the NSA hacking going on, but the paranoia that is resulting from this is breaking the original spirit of the Web. It is, after all, a Web of links, and those links were intended to be not just between siloed content, but between differe…
What would you regard as private, pray tell, if it's not being able to access a web page without telling Google (and other advertizing companies) that you're doing so? You regard a pursuit for that freedom as "paranoid"?
Linking is the great power of the Web, and is why it is what it is today. That's all. Scripting is sometimes useful, but more often than not, it's used to enable an industry of services-as-software-substitutes ([1]) to thrive. Cross-site resource requests are not important or valuable (I think they're detrimental), and they are totally replaceable anyway, as you mentioned. As HTTP2 becomes more commonplace, cross-site requests will be replaced in favor of same-site requests. I look forward to that.
[1]: https://www.gnu.org/philosophy/who-does-that-server-really-s...