Could a wizard/sorcerer/warlock use their spellcasting focus to touch the target of their spell? I.E. a wizard touching an ooze with their wand to deliver a shocking grasp or a hexblade touching a troll with their Glaive to destow a curse with sign of ill omen.
That's not really how a "focus" works. At the most basic of levels, all that a "focus" does is help you process the spell's energy. It isn't the delivery mechanism; you are. I'm presuming this is a ploy to get around consequences for touching something you shouldn't touch.
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You don't know what fear is until you've witnessed a drunk bird divebombing you while carrying a screaming Kobold throwing fire anywhere and everywhere.