This is how you have to deal with branching in almost every scm. Changing branch might require you to rebuild something slow and then it's good to have multiple

This is how you have to deal with branching in almost every scm. Changing branch might require you to rebuild something slow and then it's good to have multiple working directories. If you have monorepos you might also want to test component a on branch x vs component b on branch y etc. If you are only working serially then switching branch in one working dir is obviously easier and to be preferred but some times you really need multiple checkouts of the same repo.