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Well I read more about hub centric. There's hub centric for the spacer and hub centric for the wheel.
Any spacer that has the same center bore as the hub will be hub centric because the hub helps to center the spacer. Any spacer that is less than 10mm thick would be hub centric for the wheel automatically, because the hub will stick out and center the wheel. The space doesn't have to do anything.
Of course, if the hub only sticks out 1mm, it might not be long enough to really help to center the wheel. So someone might say you need to have at least 6mm of hub exposed to really center the wheel. So if the exposed hub is initially 10mm, any spacer thicker than 4mm is ineffective as to center the wheel in practice.
So any spacer thicker than 4mm requires extended studs for lug nuts to properly seat, and requires the sapcer to have a lip to center the wheel to be hub centric for the wheel.
Of course when the spacer is thick enough, it is easier to use a bolt-on spacer rather than a set of really long lug studs.
An interesting observation is that using spacer, especially the silp-on type is a lot easier for German cars. They can simply use longer lug bolts and there's no need to mess with lug studs and hub assembly.
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