Not everyone uses pip. Many data scientists use conda. Using you distribution's package manager is a legitimate solution.

The point is though, that this is a python packaging issue. Not an Alpine issue and not an issue that Alpine can do much about. As you linked, pypa have a big task to make packages work on every possible platform. Unfortunately, this comes as an unexpected surprise for anyone who wants to try out Alpine - maybe pip should show a warning when wheels aren't available because of musl.