Jeskai Control wants to answer your threats one-for-one with Day of Judgment, Pyroclasm-style sweepers, and countermagic like No More Lies while grinding with Jeskai Revelation and Stock Up, so proactive discard is extremely strong at stripping their answers before they matter. Duress on turns one or two can take a Day of Judgment, Jeskai Revelation, or countermagic out of their hand, buying your aggressive creatures time to close the game. Strategic Betrayal is a 2-mana answer to any single big threat they resolve, like Thor, God of Thunder, while also denying graveyard value. Deadly Precision's additional cost is a real tax when you're racing a control deck, and Callous Inspector dies to their sweepers for minimal value, so trim both.