Can you keep focusing weapons at the final boss chest in raids and get red drops?

[graceful lagoon]

Was wondering if I could spend spoils for them

[steep shadow]

for normal drops, no. I think there was a time that focusing adept drops could give the chance of a red border, but no idea if that's the case still and might not really be worth it spoils wise

since I haven't seen anyone talking about that, I assume it is no longer the case