Unless you are looking for some specific effect not possible with fresh materials it's not worth the time and money to fool around with expired films and papers.
I agree with this. At least if consistent results are desired. I recently wanted to trade some Fuji Reala 120 color film that was perfect. I wanted Kodak Tri-X in return. Only one person I know wanted to trade, and he ended up giving me a few rolls of fresh film, and a slew of old expired film. He's a good friend of mine, but a lot more 'fly by the seat of his pants' than I am.
I tried using some of the film, but it drove me nuts trying to figure out exposure and dev time, so I ended up selling it.
I've gotten paid pretty handsomely for it over on FeeBay. So now I can purchase fresh film again. Peace of mind at last.
The trouble is that film changes with time. Fresh film has a set of characteristics. Old film changes by adding base fog, contrast is lowered, and grain is accentuated. It's like a completely different film all of a sudden. So it must almost be treated as such, with testing and trying to tailor it to how we like to print. That's work I try to avoid as much as I possibly can, because to me that is a waste of time.
But, if somebody really likes to experiment, or want some level of randomness in their results, expired film might be the coolest thing ever. And I am grateful to those people because they end up using all that old film that otherwise would be discarded. Good for them, especially if they're having fun with it.