By this logic there's no necessity for any engrams to have a unique colour - if they were all white, regardless of rarity, then they'd still appear at the postmaster. I acknowledge that the type is announced once picked up and it's true that Rare Blue and Legendary Purple backgrounds are far more distinguishable in the inventory. That doesn't change the fact that being able to see the difference, before I pick them up, would be beneficial to my enjoyment of the engram experience.

Not a problem bro