Yes, the same here. It’s the screen that ‘limits’.
Printing the known test samples on my best paper, let it dry overnight and compare the ProPhoto version next to the AdobeRGB one (purposely everything in 16bit !), I could see some differencies like a brighter blue sky, some more intense red, brighter yellow – but that’s it, nothing earth shaking.
[ I even didn’t develop, edit and print my own pics yet in ProPhoto, as my last work was in B&W. ]