Simple enough, most warlock abilities are specifically screwed by this new system.
Key point is Song of flame is affected by the class, grenade and melee regen (0-100 stats) so If I don't build into those it charges them slower during use and still doesn't benefit from the bonus damage of 101 to 200 of those respective stats
Not to mention the grenade stat not working with Stasis turrets, Healing nades / Turret, Ionic sentry or Arc soul.
Nor anything for the class based focus abilities (Arc Souls, Threadlings, Child of the old gods or Hellion
So why was non of their kit even considered?
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Sounds like the same problem hunters had with mobility, a useless stat that did nothing. But as a warlock or titan pre-EoF it was a stat you did not need to worry about, infact the less you invested in mobility the faster you went. But now its a problem when the shoe is on the other foot?