[Phlogistique]

pip-compile does not use the new Pip dependency resolver, and as a result I have gotten in situations where Pip could resolve dependencies, but pip-compile would need manual pinning of many dependencies to do the same. (on one project at work it became untenable and people started updating the lockfile manually)

[rsyring]

That's helpful to know. Looks like an update to use the new resolver is close:

https://github.com/jazzband/pip-tools/pull/1539