I run a startup. It is mind boggling to have to keep updating the codebase for every new framework or library touting to be the best. Running a business means consistency and performance for less buggy maintainable codebase.
The mature thing is to keep using the same stack and only modify for newer projects and that too only if there is a warranted speedy development or something game changing. If not, stick to the basics and develop best practices within team and organizations to build things out.
My 2 paise.