Archetype free Plone 5.1?

I heard at least @agitator and @jensens claiming they are using Plone 5.1 Archetype free.

I tried it myself and with the archetypes.schemaextender dependency of in it depends on Products.Archetypes (without claiming it!) and all its further dependencies.

What's the trick?

Depend on Products CMFPlone instead of Plone. Then there should not be any dependency or other traces of Archetypes.