SOLID was created because engineers were concerned about code quality and they focused on abstraction, cohesion and encapsulation to reach the quality. But it’s not merely about how make code beautiful, actually, they create it because maintenance it the biggest fase of software development and modify a code with a bad design can break it and create a lot of bugs. Again, It’s not merely about how to make code beautiful, it’s a survival concern. Maintenance is very expensive and happens in chaotic context (tight deadlines, legacy systems, sometimes little documentation and developers need to understand what the code does).
Tássio Auad 