Hmm, your probably right.

no using this build you spam expunge and debilitating poison so think of it this way, expunge followed by a hit for 500+ = a guaranteed kill rather than when you sumtimes leave them with 100 hp, its designed for nuking, and with the reduced cds, u can spam expunge quite often along with the slow, plus every time you stealth you'll get it, and when you activate spray and pray everything in the first line of it will get hit for that much as well.

True but you don't use abilities too often to really get use out of it.

one item that i think is missing to make this build actually viable is lichbane since you use AP