> Often a custom micro-framework better suits the needs of a particular project.
Fitting the needs of a particular project is frequently a local optimum however. Often, it's much more optimal to focus on the needs of a whole team or even whole company. You can hire people who already know React/Vue/whatever, but there is no one in the world who knows your micro-framework.
It's always "tear it down" or "build it up" at the end of the day. Which one takes more effort is the right one to optimize for with your particular use case.
Fitting the needs of a particular project is frequently a local optimum however. Often, it's much more optimal to focus on the needs of a whole team or even whole company. You can hire people who already know React/Vue/whatever, but there is no one in the world who knows your micro-framework.