The point of the parent is that in an ideal situation, where everything works without flaw, theoretically it makes no difference which tools everyone uses. In real life, you having a homogeneous setup across a team makes the sysadmin's job a lot easier.
But sysadmins should be there to deploy stuff and make sure the infra does its job, not get bogged down handholding some dev that can't even compile a project.
I've worked at more than one place where administration and sys admins were the ones calling the shots. Certainly not the people actually producing stuff.
