How does the AHJ feel about the structural integrity of the roof diaphram with those slits in it?
This only works on cantilevered trusses. If the bottom of the top cord sits on the top plate then the slit will be below the insulation anyway.
It looks like more aurface area for wind and rain to get under the shingles. If you cut the first row of shingles in half to have the tar at the bottom to hold down the first row of shingles where do the nails end up? They end up exposed to the driving rain and end up rusting faster.
Just my two cents.