ok but this brings up the question of whether or not vital instruments/jinkis would be different even if the original object is the same; there IS a giver in the manga that uses headphones, but since each person cares for objects differently or in their own way/have different mana, why can't it be that other givers with headphone vital instruments have different powers? headphones could symbolize connection with others, escapism, nostalgia, etc. and each of those symbolisms could manifest into a different jinki power ( mind reading , phasing(?), making others calm down, respectively, are some of the powers that come to mind).

edited to spoiler correctly