[2021] What is the reason Jmods said that solo is the way to go at Kerapac

First of all, I like the boss, it's good but small things could be improved as always.

But now I'm just asking myself why anyone would solo Kerapac in hardmode. Kills take much longer, it's imo much harder, messing up is more punishing (duh) and I can't tell if droprates for uniques are any better. It was repeatedly said by jmods that we should solo it but surely that was only meant for normal mode right? That's why droprates should be released with bosses on release (can't see a reason why they aren't released for everything but whatever).