I'm writing this blog post just now, because I recently had a conversation with Carl Shulman, who proposed an argument against temporal discounting that is, as far as I know, novel: namely that an AI with a 5% temporal discount rate has a nearly infinite incentive to expend all available resources on attempting time travel - maybe hunting for wormholes with a terminus in the past.

Probably not if it knows how hopeless that is - or if it has anything useful to be getting on with.

With discounting, time is of the essence - it is not to be wasted on idle fantasies.