Seajet
...
The 'windage' idea is the sort of total ballox that you only find in here, we sail our Finngulf with the hood both up and down racing and cruising and there is no discernable difference in speed or vmg either upwind or down, (though our log only reads to a tenth of a knot). Admittedly the hood is narrower than average and we do not use dodgers. Because the boat is usually steered from the coaming it does not obstruct visibility either. The main reason to put it down is to increase cooling on a hot day.
There is always an obtuse viewpoint but if hoods were such a bad notion 95% of serious sailors would not be using them.
As to ' serious sailors ' using sprayhoods I don't see many racing boats with them; windage affects handling at close quarters, probably significantly more than overall performance.
I'm surprised you think windage is ' bollox ', it's rather a well known concept.