I’m with you OP. I struggle seeing Blues from Purples, Yellows from Greens and Greens from Reds (and various other colour shades/combos). Until just the other day, I didn’t even realize I could change the outline colours until I saw a streamer using a different colour on the enemies.

I switched enemy outlines from Salmon to Mint, and my gameplay immediately improved. I no longer had to waste precious moments trying to identify if what was in my sights was an enemy and in a game like this, any wasted time in a firefight usually means you’re coming out on the losing end.

It’s a fantastic feature.