I'm not in web anymore but, to me, it seemed easier to visualize richly linked data in Angular than having a Django template render it. Once you have the mindset of making your website into an app, you are tempted to move navigation to the app too. That way your app can keep delivering its core user function without the interruption of a page load.

In retrospect it was slightly hubristic, as in reality you sometimes have to force reload SPA's, and if you're integrating on top of legacy systems that you just link to, you're not really avoiding the bad UX of a jarring page load. But I do find it elegant to separate presentation from data.