No doubt that USGA play differently than topsoil with XGD.
Or, that even a 5 year old sand based green plays and maintains differently than a 1 or 2 year old one, etc. It is one case to be made against long term renovations where new greens mix is contemplated.
We often forget that the USGA green was developed mostly to avoid compaction, because in theory, sand doesn't compact. Also, not a coincidence that sand based came into favor around the time automatic irrigation and pelletized fertilizers were becoming more reliable and widely used.
If you don't have them, other techniques had been developed prior to USGA greens and if play is low enough and climate favorable enough, they can last. Shel, I'm guessing they have been core aerified regularly over the years, which reduces compaction and gradually converts a green to a higher percentage of sand?