Hmm, fair point! I think this would definitely work, but only in the case where you have just two things (or in the more general case, a fixed number of things

Hmm, fair point! I think this would definitely work, but only in the case where you have just two things (or in the more general case, a fixed number of things based on modulo n) generating IDs. You're essentially dividing your keyspace into two from the beginning. So then, to add another generator, you'd have to have a scheme that transparently updates all of your generator nodes to do mod 1 mod 2 mod 3 etc. It definitely could work though, if that's what you need.