WOW. Interesting to hear and see all of this advice.
The problem you may have - is that many "hip" roofs don't allow for enough ridge vent to be installed and be to code - or effective.
In my career - one of my responsibilities was for the largest ridge vent manufacturer (and shingle) in North America.
Here is a simple fact: on many of the hip roofs I see in The Villages - a ridge vent does not provide enough "exhaust."
When you don't have enough "exhaust" you have the following potential consequences:
1) Health Risk... because the recipe for mold is warm air, dark environment, organic material and moisture.
2) Void Manufacturer Warranty... every shingle manufacturer requires ventilation to code. Not enough exhaust - not to code!
3) Higher Energy Bills... % moisture in the insulation drops its effectiveness by 1/3
4) Shorten Shingle Life... too much heat to the roof deck fries out the shingles.
Me personally - keep the power vents!
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