I also agree with this and the 1st post: the kuva lich is thematically questionable. They said they are unkillable, but in gameplay never demonstrate that besides going from larva to lich. For the entire cycle, it is either it one shoting you or you killing it with a stab.
DE says this is inspired by shadow of mordor, but shadow of mordor works because it is always possible to kill your nemesis provided you are on point with your gameplay, or you could just run away and try later. You are never punished based on a randomness in game mechanics (order/name of mods). While I don't mind losing 1 revive to the lich (since I play solo mostly), most players are conditioned to dislike failure, especially through no fault of ther own.
and yes lich trading makes no sense. It is slave trading. What is wrong with just trading the weapon after you claim it from foundry? It is not like we don't already have weapons that are tradable as long as it is unranked and un potatoed. In terms of gameplay, you are still wasting hours to get rid of a lich (read: weapon) you don't care about. We NEED a way to cycle through lichs that gives us nothing (and no one would want to trade for) . Personal experience: 29% heat seer with no ephemera, honestly what is even the point?