Project Groups Documentation?

Weren’t Project Groups superceded by Lifecycles?

This page should probably be updated/removed:

Hi,

Thanks for letting us know about this. I have added a note to the page stating that retention policies and environments are now managed by Lifecycles.
However the concept of Project Groups is still relevant for those using a version below 2.6 but also those who need to group projects for permissions and grouping on the dashboard.

Thanks!
Vanessa