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Because it allows for an even better adjustment range, and is much more reliable resetting the sear. The factory screw is much thicker, and a bit shorter... it's only job is to make sure the sear engages. So, as you back the screw out the spring is under less compression (and it doesn't have much range)... sometimes to the point of having the sear not reset and the hammer drop on a rigorous run of the bolt. I've had it happen more than once with the screws way backed out. Take yours out, make sure it's empty.... and cycle the bolt hard... see if the hammer ever drops when closing the action.

The YoDave spring is lighter, that allows you to keep the spring under good compression (thus maintaining solid sear engagement), yet maintain the lower trigger pulls achievable by filing the head down.

Here's the pic of the two screws.... OEM on top, YoDave below...