Some great thoughts on here.
Let's over simplify things rather than complicate them.
A naturally aspirated engine makes its power due to the cam and head combo.
A turbo car makes its power due to the turbo, followed by cam and head. That's where the confusion comes in, another variable, even when simplifying it.
As per some here, I know enough about cams to know I don't know enough. It's full on. To put it in perspective a mate who is full on into drag racing (v8 big blocks) very recently paid 5000 for a cam. Is a cam itself ever worth that? No. It's the knowledge behind the cam. This is a smart dude who's knowledge and dedication and experience is immense, and he still spent the cash for someone else's knowledge on the cam. He didn't try to design his own because he knew he didn't know enough. When he got the cam he rang the supplier (In the states) as he was surprised as the cam seemed smaller than he was used to. Sure enough it was a winning setup that shouldn't have been doubted, although on paper most would have looked elsewhere.
Also As mentioned , advertised duration doesn't really mean jack, and it's the subtle differences in ramp rate etc that make all th differences, which is not reflected until it is used. And who ever changes a cam only on a turbo car and retunes for comparison? I would love to see it but most wouldn't bother, usually it's multiple changes and once.