I think this would work well for operations like combining two drives into one larger logical drive since you would reduce the risk amplification from such a co

I think this would work well for operations like combining two drives into one larger logical drive since you would reduce the risk amplification from such a configuration. In the typical case, when you stitch two drives together you end up doubling the risk since if either drive fails, the whole system may be unrecoverable. With capacity variance, you would presumably notice one of the physical drives shrinking giving you warning that the drive needs to be replaced in a user comprehendible way.