In Windchill 10.2 PTC offers the new "Critically Patch Set" -Strategy (CPS).
The reason was to keep Bug-Fixing as simple as possible (via monthly CPS) and release new features via Maintenance Release (Mxxx).
At the moment new versions of Windchill Workgroup Managers (WGM) will also released via CPS.
As a consequence - the effort to implement a CPS is much higher (nearly the same like a Maintenance!) as it should be.
Example: If you are using Windchill Workgroup Manager for CATIA V5 - and you plan to install the latest CPS (due security reasons or whatever) - it might happen that you have to reconfigure the whole WGM including Abstraction Libraries for CATIA!
Also all fileservers has to be updated after CPS.
So it would be very helpful to keep new WGM releases separately from CPS. Or better: Make the WGM completely independent within a Windchill Major Release!
Example: Customer is on Windchill 10.2 M020 and needs a fix for a security issue or a bug. It should be possible to fix this without installing a new WGM.
Example: Customer is on Windchill 10.2 M020 and needs Support for CATIA V5-6 R2015. It should be possible to install only a new WGM-Version - without a complete Maintenance