I didn't even know 64GB RAM was an option!
Wow, that's a serious machine.
For giggles, I just spec'd out a fully-loaded 16" MacBook Pro (i9, 64GB RAM, 8TB SSD, 8GB graphics) for the tidy sum of $6,699. It adds up pretty quick, going Cadillac! I think that might've been the first time I've ever done so with that particular model (because I knew it was something I'd never own; I usually do this kind of thing with the iMac, Air and 13" MacBook Pro).
I didn't know those graphics and storage options were available either. I'm really clueless on that 16" model.