A Psion Telepath might be the kind of witch you are looking for, with nonflashy mind-altering spells, and perhaps objects infused with psionic intention. Dabble in Prescience to alter futures into blessings and curses.I see we're arguing in circles. So, I'll be clear.
I want a witch class that is encouraged, mechanically, to do witchy things like brew potions in cauldrons, subtly curse people, and cast a variety of subtle spells that manipulate and enchant others.
I have a Magic-User (Wizard) class which is mechanically encouraged to study magic tomes during occasional rest periods, acquire new spells by whatever means, and not wear armor or use weapons.
I have a Fighter class which is mechanically encouraged to wield weapons and use tactics in battle, wearing the best armor they can get.
I have a Thief (Rogue) class which is mechanically encouraged to be sneaky, learn a wide variety of trades, and get out of the thick of things.
I have a Warlock class which is mechanically encouraged to blast magic laser beams at first opportunity and cast a few very flashy spells as soon as a threat appears. I guess that's exactly what I wanted to begin with. I'm glad you guys kept just telling me, "The warlock is exactly the class you were looking for all along;" because, obviously that's the perfect implementation.