We are talking about pit.
All A tier builds from any class can beat horde 8 with ease. I could do it with my blizz sorc lol.
And your statement about needing only the amulet shows youve never played this build before.
Anyway, if the devs really study the problem, they will cap the simultaneous lightening spears (like they do for all other conjurations) and the bug where there is bugged damage between ice shield and stormswell. If the devs halfhazzardly just look at barb complaints, they will nerf all defensive skills for sorc like they did in s5.