I may be off somewhat, but my recollection is that support for metadata-blocksize != (other)blocksize came after POOLs.
And the doc for mmcrfs seems to indicate that if you want to specify a metadata-blocksize != blocksize, then system pool must be comprised of all metadataonly disks. Which is consistent with my understanding that all the disks in a given pool have equal blocksize. So my point was, if you want to segregate data from metadata, think only about pools first. Then worry about blocksizes and metadataonly disks.
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