Nymzavril wrote:

Plus different knives for different tasks need different grinds

Which is why freehand is the best overall sharpening system. With the wood trick I can find any angle and match it, or I can adjust my angle to get any grind I want. With the Lansky you are limited to 4 angles. If you have a blade that needs just a light touchup but the angle of the blade is somewhere in between the angles provided by the Lansky, then you are forced to completely regrind the edge to one of the Lansky angles. That's a whole lot of work and a waste of steel. Then when you sharpen that same knife again, unless you get it clamped exactly the same as last time, you'll need to re-grind again.