Consumable parts are and have never been reused. Just sounds like you had a faulty part, rather than a reused one.
Are phone parts "consumable"? I thought "consumable" meant refers to things that get "used up" like milk, ink, pens, etc., not storage media or LCD screens or the like...
It's not worth it to extract the lithium, monetarily speaking.
Can you substantiate that? It's clearly at odds with my experience, neither of my two replacement units had a battery life that even came close to unboxed unit.
I just don't buy that every serviced device gets a new battery.
(I am in Europe by the way)