The rewards from the season mechancis are only tradeable with resonances. I tried gifting a few really good items to my mate in coop very early on, but unfotunately that is not possible without resonances.
I think this should be changed, so you can even fish for good stuff with the ice ritual for your friends.
I think his point is that he’s playing co-op and drops are giftable without needing a resonance, but the mechanic rewards aren’t.
I’m assuming it’s because it doesn’t really count as a drop. I expect both Nemesis and Omen drops are giftable as long as the other person is in the same map. It’s just these don’t because they don’t actually drop, although they should (be giftable, not drop).