MVC and OOP are simply “ways,” among others. Yes, they are great, make it easy to write code, and are used a lot, but this is not the only way to develop the application.
For example, Drupal does not use any object-oriented code: it is all procedural ... And this is a great application that has great success, is used by many people, even on large sites, and for which many people have developed many modules ... even if it almost does not use any class / object!
I, personnaly, MVC / ; , , - , : , - , ^^