Dunno, Jason. The Micropore cartridge has real advantages, like higher resistance to caustic cocktails and no clumping when wet, keeping WOB at a level.
Pre-packed granular sorb don't offer those, just ease of use and not packing the sorb wrongly. On the downside I'm sure are increased cost and more junk to dispose.
Other companies tried it in the past, and quickly offered refillable canisters on customer's demand.
Am curious though how "perfectly" factory packed axial, self-packed radial and the ExtendAir compare in duration, would love to see the raw data from the CE test runs.