I don't own any where enough JP knives to really comment on the factory cutting edges most makers give us. Or, the edge angle, over polishing as you put it... Just seems to me a good cutlery would not ship a knife that wasn't up to their standards. Also, I think it depends on the particular cutlery and batch.
Now, if you're changing the geometry of a knife to make it more suitable for said task, that's a different story. Though, I would ask, "Why not buy a knife with the right geometry & other characteristics for the intended task in the first place??".
As for modifying a Ferrari to go faster...let's just say I wouldn't change it's geometry.
And while I'm aware of all the tuners out there for Ferrari (e.g. Underground Racing) and other super-cars I honestly don't see the point for the typical driver. Driving from stop light to stop light. A tiny percentage go on "track days". A stock Ferrari 458 is more than "fast enough" for the street. Especially if you live in a major metropolitan city.
The only aspect of a knife I would change is the degree of sharpness (and possibly polish on the cutting edge...more, less...) from the factory. Which for me is already sharper than I'm used to.