Okay, so in your character’s stash. Remember that a Primal item has a different background. Looks like Diablo. Maybe the background of the item could be a different color. Maybe that should be red as well? That could help, unless of course you are color blind. Then again, can’t please everyone.
As for going through your stash on your character and in town, you clearly have two choices. (1) You could go all Helter Skelter and DE all of your items, not caring for the rarity of the item. (2) You can slow down a bit and not risk DE’ing an item that may be useful to you.
If you have a real problem with (2), then I suggest you place all of your Legendary items in your stash in town. When you are done gaming, i.e. Greater Rifts, Rifts, Bounties, etc., then go back into town in a SOLO GAME and carefully go through your stash and see what is worth keeping and what needs to be salvaged.
If that is also unacceptable, then maybe you need to find another game.
EDIT: From time to time, I do that with bounty caches as I am doing speed runs. It doesn’t matter if I am playing solo or multiplayer. While I do that, I often place Legendary items in there as well. Need to remember that D3 is more than just mob blasting. It’s item management as well.