Re: Why strip strike?
The other thing with lifting the rod is that some of the pressure of the set is actually absorbed by the flex of the rod. A rods entire job is to absorb pressure, and this isn't always what you want. Strip striking ensures that every pound you pull is transferred directly into the strike.
A secondary reason (and some people consider this the main reason) is that a strip strike doesn't always cost you the fish if it is ill timed. If you lift the rod to strike, the fly moved very unnaturally and in many cases comes clear out of the water. Strip striking simply looks like a quick dart of the fish to avoid being eaten, and in many cases will not deter the fish from striking again. This is the primary reason I do it.