I just told you we successfully do exactly this. Note, it was different ~5 years ago. When we wanted to upgrade from react 15 to 16 for better runtime speed, w

I just told you we successfully do exactly this. Note, it was different ~5 years ago. When we wanted to upgrade from react 15 to 16 for better runtime speed, we had to upgrade babel first and that required a webpack upgrade iirc. It was a mess. But the ecosystem has matured a lot since then and we haven't done major setup changes since. It just works.