I'm working on a project where the customer has a lot of AF servers, and any content we make must be available in all servers - therefore we must use AF 2015 R2.
Turns out (surprise, surprise) - this version is rather buggy when it comes to the Analysis functionality.
Feature-wise it's OK. According to https://techsupport.osisoft.com/Products/PI-Server/PI-AF/Overview/ the main functionality differences would be the attribute traits, and something related to event frames.
If we were to design the AF stuff in a newer system, how would that work out when we export it back to our 2015 R2? What are the bits we need to avoid using in order for this to work?