[rlander]

The specific reason not to switch to Jinja2 was that Django's templating language was originally intended not to be that powerful, so that you could feel reasonably safe handing it to non-technical "designers" or "writers"

Jinja2 follows this same philosophy of a sandboxed engine and the syntax matches django's almost exactly (it was actually based on django templates). The designer wouldn't even notice he is dealing with a different templating language.

So, it looks the same from a designer perspective, is at least an order of magnitude faster and is much simpler to extend. So, why not switch?