I succeded in running the 1st PUP version on my 1200/bppc/grex setup... it was just an empty OS
Well, in that sense it resembles any other Amiga OS IMHO. How would you describe a fresh install of OS 3.1? ;-)
What you have after install is a foundation on which you can build whatever you want, the way you want it. Just like any Amigan should be used to do, right? But maybe some Amigans have had their classic systems running for such long time now, with a decade of extending it, installing new apps, patches, etc, that they have forgotten that what they actually got after they made their latest fresh install was nothing more than "just an empty OS"... ;-)