As a semi-retired engineer i also have the compulsion to fully UNDERSTAND how things work. "It's just better" without explanation simply raises MORE questions. I don't own a CDT trigger blade but can make some educated guesses about how it works.I think the CDT trigger blade makes the trigger a TRUE 2-stage trigger. Initial first-stage blade travel reduces sear overlap to a near release point.Then second-stage blade travel quickly releases piston latch.The longer screw adjustment simply pre-moves the sears to a much smaller overlap. First-stage trigger blade travel is just "take-up-slack" and does nothing to actual sear overlap. The longer screw method does work and can FEEL exactly the same as a true 2-stage trigger. However it is inherently less secure/reliable than the true 2-stage trigger blade solution.Each person needs to decide what THEY want to have and what THEY want to $pend to get there :-)
They are made in Spain