Is that boot flashing going to leak the way it is installed?
Why does the shingle tab have to cover the boot flashing as shown on the OP’s pic.?
other than the caulk being unnecessary and not attractive if You are standing on the roof looking down on it , I don’t see that much wrong with that install…It doesn’t look like it would leak to me barring a hurricane…I guess You could nit pick anything if You really like 1000 page reports…
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Exactly, aesthetics is not a Defect.
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Kozy Kollar products are the only roof vent boot/flashing or exhaust hood you install from inside a building and over shingles or similar roofing materials. Patented and proven, both systems form a weathertight seal for vent pipe penetrations and utilizes three independent gasket systems which are designed to work in conjunction with each other to keep out the elements and you off the roof.
Plumbers that don’t like to climb on roofs use this type of vent boot often, So if you see a vent boot like this, It is design to go on top of the shingles. I see them often.
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It all looks good from 10,000 feet! 
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Pretty slick.
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