Would you mind sharing a source for that, or better yet, a picture of where the seams are for the head / hands/feet portion.
The specific unwrap for the head is kinda bad.
The nose is too squished together / distorted to allow for fine texturing of the nose Ala.
Still, what matters more is the uv island scale matching.
If the UVs of meta humans are still as you showed, the seams are more or less visible based on the difference in scaling between islands (head vs body).
I also had a look at the Genesis 8 uvs.
They too have separate areas and present obvious texturing issues (because as you pointed out they are also separate, but they have different scaling factors on the islands as well).
In comparison, at least the UV you showed seems proportional.
Anyway,
Insight on how to get that UV pattern would be greatly appreciated.