On my Blackbird I have the Benz Micro LPS on one tonearm and a retipped Zu/Denon DL-103 MK 2 on the other. Yes, the Benz is better across the board, and I still enjoy listening to the DL-103, especially with rock albums. Part of the fun is being able to go back and forth, with his table and arm/headshell he has the capability to do just that basically.
I’m a cable “believer” in as much as I’ve noticed varying degrees of difference between cables, but transducers and the room are the vast majority of what your system sounds like. I say he’d have more fun with the cart and wouldn’t be straining to hear differences.