Considering Wordpress isn't and probably will never be a true MVC application, I don't see the point of adding in a template parser like Twig and separating cod

Considering Wordpress isn't and probably will never be a true MVC application, I don't see the point of adding in a template parser like Twig and separating code. All it does is adds unnecessary overhead all at the cost of prettier code, there's no other advantage to be honest considering PHP itself is already somewhat a templating engine. If people want a CMS that separates code from the presentation layer, they probably shouldn't be using Wordpress and considering Drupal instead. I've used Drupal and Wordpress quite extensively and let me tell you, after building one site in Drupal you truly appreciate just how easy Wordpress makes it to get stuff done in half the time even if it is at the cost of prettier code (clients don't care about code cleanliness all they care about is results and Wordpress gets results).