I didn't claim that they
were from the time.
What I am saying is much simpler: that DR didn't deliver a Mac-like GEM on the PC for the excellent reason that Apple sued them to stop them doing it. That's why PC GEM got crippled, and ended up as just a file manager/app launcher in the form of ViewMax.
(It is also worth nothing that Caldera subsidiary Lineo made GEM GPL around the turn of the century, and since then, PC GEM regained all the features Apple made DR remove and more, including Bézier curve support and things.)
All I am saying is that Atari GEM wasn't crippled, was a popular and well-loved GUI that people are still using and working on even today.
https://emutos.sourceforge.io/
https://aranym.github.io/afros.html