Craig Kilburn of vmFocus comments:
Depending on the size of the environment, you might see one or many vCenter’s with embedded services. External services such as SRM, vROPs, Horizon View would then hook into the vCenter.
From an architectural standpoint, you knew that deploying a vCenter with embedded services you would cover most if not all future third party deployment scenarios e.g. add on SRM you are covered.
With vSphere 6, this has all changed and I would question if deploying a vCenter with an embedded Platform Services Controller is the right way to go.
The shift to external controllers is something happening all across the industry. It will be interesting to see how virtualization fares.
Read more at: External Platform Services Controller, The New Standard?