In my experience writing web apps for many years (frontend and backend), you either (1) start off with an existing framework, (2) write your own, or (3) end up

In my experience writing web apps for many years (frontend and backend), you either (1) start off with an existing framework, (2) write your own, or (3) end up with a mess. You really shouldn't be doing (2) unless you've had several go-arounds with (1). (3) is, of course, undesirable.