As an old developer 30+ years. I love to build from scratch with no frameworks, but it is not viable for corporate development requirements. For many personal and yes large projects I still write from scratch. I will be the first to admit I hate building pretty sites so mainly focus on functionality rather than look and feel. Again corporate world would hate that. Frameworks make things easier, and faster, and yeah mostly run better. But they do lose the details of developer really knowing what every bit is used for, and how they made it work.