Regression testing is inevitable, but with a minimal framework, you'll essentially end up rewriting the controllers, and part of the views. If you switch templa

Regression testing is inevitable, but with a minimal framework, you'll essentially end up rewriting the controllers, and part of the views. If you switch templating systems, modifying the views can't be helped. And the controllers should only be a glue between your view and the service layer, so it ought to be solely administrative code.