I read that WD is just squeezing another without HAMR, but Seagate should have the 30TB out with the HAMR.
Maybe the larger drives will bring down the 24TB prices. That's the minimum size I'd replace 18TB with.
I feel that all the uneven capacities, 10, 14, 18, 22, 26 TB will go away at some point. There are just a crazy number of SKUs to keep in production.