You lose super OP stuff like time parasite, reaping knives, and shared nightmare
I just discovered an amazing synergy with ydwin as a pure rogue
I give her reaping knives, she has 100% hit to crit conversion with gambit max guile, so she always crits, so she can spam it forever
And you don't need survivability from lvl 13 on you just have perma barring death's door on with priest
I feel like SC is underepresented on this forum, at least from the stuff I've read so far
They are pretty OP in a party
I guess on a solo multiclass should be better though