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Aside from faster cat light off and smaller packaging, an integrated cooled exhaust manifold is a lot lighter than the usual steel manifold. E.g. 4 cylinder headers might be around 15lbs while the short aluminum piece built into the head is barely 3lbs with the coolant jacket. It's also easier to manufacture, and decreases coolant warm up time.
On a car, the extra heat that the radiator needs to get rid of is negligible.
I think the subpar exhaust scavenging is actually a detriment though. The issue is that at high load you are more knock limited, so the compression ratio can't be set as high. It's better to have a high compression ratio and use cooled EGR.
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