MicrosoftI'm seeing Project Server Subscription edition as an option that a. Microsoft provides/suggests and b. organisations are considering. Whilst I appreciate that as a migration option it potentially makes sense regarding continuity I can't see that it really makes business sense at all if it can be avoided. This is an On-prem solution that has seen no ongoing solution development functionality-wise for years. It requires a skillset to install and manage (or an outsourced partner) and is based on dated functionality and a poor historical user interface. I have not seen any guarantees of longevity other than the Modern Lifecycle Policy -https://learn.microsoft.com/en-us/lifecycle/policies/modern which guarantees a years notice and don't forget there are a bunch of underlying components outside the Project teams control such as SharePoint that will influence this. For those moving from online to on-prem might you end up in six months migrating again?
For longevity I see the choice for the long term is realistically Planner Premium and Power Platform, if that provides enough capability for your use cases, or a third party solution that provides the modern SAAS experience for Enterprise PPM in a single Microsoft platform such as edison365
A big problem with Project Server Subscription is that they have deprecated the OData reporting service. Anything that relies upon that will need to be rewritten. I also assume that any Power Automate jobs that use the connector will not work either and need to be rewritten. I'm assuming that the ProjectServer api's will continue to be supported.
