I'm certainly no stranger to grinding in this game, and I'm sure all I could say about the Liches right now has already been said, so I'll cut right to my proposed solution.
Perhaps we can cut maybe just one layer off the RNG? Like, make Requiem Mods permanent? I just found out they were consumed after 3 uses and that was the last straw for me. That's just... Oof. That's too much. These middle-tier rewards in relics, so I'm already:
Gambling that I'm even gonna find one, (I got 3 weapon exilus bps)
Then it's gotta be the one that I want. (I got all the ones I don't need yet)
Then I have to play codebreaker to find the sequence I actually equip them in to function (Still unlocking the 3rd requiem)
Then they go away
I know I'm just a player, so what do I know about balance? But maybe? Please? Can I just... keep them, for my trouble? If you don't, well... I mean I'd rather farm Sabot Rounds or Augur Secrets to trade for kuva weapons, at that point. I actually enjoy those grinds.