I don't use Hot Hand, and really, the talent is the worst on the tier by far so extra stuff on it doesn't change much in terms of optimization. The reason that I use Crash Lightning with Crashing Storm is, as you can see in the logs, the average DPC is a 5%~ lower than a Lava Lash, whilst it costs 33% less Maelstrom. Having more Maelstrom to use in a Boulderfist build means more casts in between, and you aren't strictly GCD locked so "most damage per cast" is not how you judge them at all.
The point of having the dumps so high on Maelstrom (generally speaking it's 60+(20 if Tempest)+[cost]) is so you have to waste no time generating with Stormbringer and still keep a reserve in case of chain procs. Obviously, the more comfortable you get with it the better you can read your resource situation and can be more aggressive with spenders which is arguably the most important part, the point of the rotation there (whcih was mostly a rough draft, didn't realise they would publish it so fast
) is to ease people into management of Maelstrom, since it's very hard to teach people on the spot to read their gains and expenditures.
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Also, for those asking about pre-patch stuff, this doc will cover the major questions that keep coming up
:
Pre-Patch Cheat Sheet