How is it crazy? I think a lot of big companies have design standards and then some teams create UI libs that follow those standards (and then the UI/UX design

How is it crazy? I think a lot of big companies have design standards and then some teams create UI libs that follow those standards (and then the UI/UX designers will use the design standards while devs use the ui lib). That’s plenty of reusability, and if you really need to share some components between two MFEs then maybe they should just be 1 MFE. A page footer could easily just be a small react component library built on top of the ui lib, and then everybody can just import it and stick it at the bottom of their MFEs.