Thing is, most Coils were movement heavy. With how punishing movement is now, SMN will easily take the throne unless we get T8 again which was one fight out of 13.
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You can't assume full duration of Thundercloud though. Most of the time you get it, there is already duration remaining. Furthermore, you then have to use a F1 afterwards, which costs more Mana than a F4, meaning you'll lose another F4 from your rotation later on.
It shouldn't be a DPS loss to lose procs.
thundercloud doesn't get astral fire bonuses