Trivial or not, working within an existing library provides a level of maintainability you just don't get when you toss in something like Tornado to do the tiny

Trivial or not, working within an existing library provides a level of maintainability you just don't get when you toss in something like Tornado to do the tiny bit of your app that requires a persistent connection and websockets. Even if all I got was django's router and views, it's save me the awful headache of having to graft Tornado and Django together, coding under two entirely different library sets.