Exactly my point, it saves time. The witch is super easy and fast (unlike the confluxes on hard mode) even without a full fireteam, but what's the point in doing it more than once when there's no reward for it.

I've carried scrubs thru, almost it was as good as soloing it. I was the only one inside, everyone else was outside shooting knights. my tactic, run out, use the solar nades to the crystal to pull the witches. get up into a boomer tower, IB the witches. if they are dodging or you feel rushed RL them (no ghorn for me), but try to save ammo. I tend to get the witches down before the shreakers spawn and I will try and pop a few ranged knights / acolytes. before tunning in to take out one shreaker then running to the other side and taking otu the other. then I will back otu to just past the door and try and take out some more ranged untill the main wizard starts to sing. then I will run in jump ontop of a door in the crystal room and IB the main witch while she sings. extremely easy to burn her down fast while she is singing cause she does not move. a black hammer may be even better but I've not tried it because my IB is always on.

Nah the point is you aren't good enough to beat the raids without skipping parts.