I can think of one great potential use case that I had for micro frontends a few years ago. We had a legacy angular 1 site and google decided to just up and re-write the whole dam framework. As the years wore on it became harder and harder to work with, especially knowing how much better front end libraries and paradigms had gotten. When the time came, we ended up doing a full rebuild ground up to get it off the angular 1 monolith. A pattern like this would have allowed us to gradually move pieces of the site more easily.
Cost wise it may have ended up being roughly the same for the client but in a micro frontends system we probably could have moved a few pages each month over to react rather than do a bit switcheroo after a big multi-month redesign / rebuild. It's a good tool to have in the kit if another situation like this arises.
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