What junk? I don't have any junk. That's y some people need more space.

Everyone has junk in their vault. Most gear in the game will never be good enough and most gear that is will never get used making it junk gear. I keep only the absolute best rolls and then only keep a couple alternatives and some spare armour (maybe 50 pieces total across all classes). Im at 350 space used and half of it is still junk because i know i have the space to keep momento gear (vanilla d2 starting gear, trinkets from ITL, first flawless weapon, bugged drops etc.) You have plenty of vault space if youre actually careful with it and dont try to store 1 of everything.

Some of it is junk... UNTIL they buff a particular perk and then it's not...

So youre gonna hold onto every possible roll if every weapon? Bungie rarely buffs a perk so much it shifts the meta.