I guess, I'll share my memory about newbie mistake too. Please don't judge me too hard
I joined Granblue Fantasy during "What Makes the Sky Blue" event and somehow got 1 Damascus Ingot (I don't remember how >_>, I was overwhelmed by the game at that time). Also at that time I had only 1 SSR weapon - Turpin Spear (yes, from Carmelina, no matter what others say, I like this peace loving Draph girl ). I didn't know anything about weapons' pool/grid, optimization, focusing on 1 element, skills, etc. I was focusing only on gathering weapons with the highest attack. I figured that spending Damascus Ingot for uncapping SSR weapon is a good investment anyway, since, well, it is a SSR weapon - highest rarity. So...yes, you guessed right, I spent my only Damascus Ingot on uncapping the Turpin Spear >_>
Yes, probably, for some it is not such a big deal, since Damascus Ingots are not so rare as Gold ones, but I was low level at that time with ~13 PWR and even such things as Damascus Ingots were/are great rarity for me.
I just hope that this girl
was/is at least happy with her Grandcypher's captain for choosing her weapon for sacrificing Damascus Ingot on.
I apologize for my mistakes, because it's not my native language.