I did some work on two related libraries in the last few days which weren’t using Dune, so was using
opam pin extensively. Having added the features I wanted, and made pull requests, I then converted the two libraries to use Dune.
I’ve written a post comparing the workflow using
opam pin with how much more efficient it is using the composition feature of Dune to compile multiple libraries which you’re working on at once. Hope it might be an informative demo for why you might want to convert your own libraries to Dune too