Don't delete things with great perks, also don't delete because some stuff is still useful in crucible. Do you have any idea how fast I run and jump around as an agility build stalker with MIDA and boots of eos or whatever they are called... Fast... Let's just say fast... How is that not useful for Rift crucible?

Keep them. Some quests for exotic or legendary Guns require you to dismantle rare or legendary weapons in order to get the next step. Better have these olds on reserve for stuff like this instead of having to spend more time to look for weapons to dismantle. For example: my stillpiercer sniper had a step in which I needed to dismantle rare and/or legendary snipers in order to complete it.