Remember that a wizard's power isn't just a tool and a thing they can do. It's not like taking the driver's license away from a drunk, or banning a violent offender from purchasing a weapon.
Magic is part of who and what the wizard is. It's an intrinsic part of them, body, mind and soul. It's their identity, it is synonymous with their self.
This^^^.
I don't think you can
steal a Wizard's magic, leaving the Wizard otherwise unhurt. We know that some creatures can more-or-less eat part of the Wizard, and thus gain at least temporary access to at least some of his abilities, but this tears something fundamental out of the Wizard. It might grow back, but it's not like taking a gun or a knife or a tool away from a person. It's more like cutting off their hand. Cutting off a hand is pretty harmful, even if the person can grow a new hand in time.
JB has said that Goodman Grey could devour Harry's essence like a naglooshi, but in so doing he would absorb so much of Harry that he would essentially rewrite himself into a copy of Harry. You'd have a near-perfect physical, mental, and spiritual duplicate of Harry running around, but Harry would be dead or in a coma or something.
Sacrifice on the Stone Table isn't stealing a Wizard's power, it's killing the Wizard and devouring his essence. Rather a different thing.
Now what probably is possible, though difficult, would be temporarily
suppressing a Wizard's power so he can't use it. That's almost surely doable, but it's also probably very difficult to do, hard to make stick, hard to make reliable, and a good deal more trouble than beheading or putting a bullet in him.
I mean suppose someone suppressed Harry's magic so he was essentially a normal man. Would that make him harmless? Well, he could still shoot you, still call in a favor from someone, still sic the Za-Guard on you, might still know some Names that would let him use ritual magic even without his own power, and at any given time he might regain his power. If you were Harry's enemy, it would be far safer to kill him.