Hey Thomas,
as someone who doesn't use LUTs much (except for transforms or maybe on set monitoring), I don't quite get your question. There are some companies out there who say they scan filmstock and build the LUTs from that. I suppose you can do that with pure maths without using Resolve, based on response curves. While it's cool that you can technically use them if you 100% want to emulate a specific stock when mixing with material shot on actual film, I've not yet had a good reason to hunt for "amazing" LUTs, and I find I've become a better colorist for doing more manual adjustments.