Sunslinger is clearly optimised for teamwork. Void is clearly optimised for DPS. There is not much in it but it's hard to beat void for cutting through boss enemies and high level mobs. I switch to subslinger only for co-op and when key mobs are solar shield. Interesting! Point is, gear is badly imbalanced between the classes.

Clearly your weapons aren't lvl'd because I rarely use my nova bomb because my weapons shred through bosses. Which makes sunsinger better for solo because you can revive, where as void walker you can just have teammates heal you so that's better for co-op.

Your argument is now that class gear imbalance doesn't matter because nobody really needs grenades? Dude!