unusable items in red

A nice QOL feature that should be implemented is unusable items should be red. that way it lets us see which items are able to be equipped instead of having to hover over every item to see the item level. There is currently no way to see by a glance which items are able to be equipped.

What are you talking about? That’s exactly how it works already…
Can’t use the red ones. Can’t afford the “filled” ones. No border is common, yellow border is a magical item, green item is rare.

He’s probably not noticing it. Especially on smaller items (rings and components) it’s often hard to see the orange-red background. It’s not very obvious, especially given how close it is to yellow.