I'm having a difficult time envisioning a shot from that angle where you can't use the point to sink the object ball.
I don't believe in drills much but a good drill is putting a ball in the jaws of a corner pocket or near the pocket and moving the cue ball to various points on the table.
I think you take 'can't' too literally, perhaps.
I would guess neil's can't really means could, but you got no idea where the cb is going after...aka 'can't' for all intents/ porpoises.