When we do a large implementation, we need functionalities which will be used by multiple classes and we leverage OOPS features in such scenarios. the decision to use it or not ultimately comes down to the point that will it make our life easier or not.. yes we can write separate class and method but that will ultimately make us do more repetitive work again and again plus it will also create other problems.

@@SalesforceandInterviewsInHindi Thank you so much for clarifying