32 GB of Optane for $77 is $2.40 per GB, Samsung 850 Pro 1 TB is $0.50 per GB. Intel is nearly 5x more expensive.
Hybrid storage systems are common in the enterprise SAN market, but generally to be useful they need something like 20% of capacity to be flash. At ratios of 1-3% of HDD capacity, I don't see the Intel use case as being especially useful.
I had a Seagate 2.5" years ago that was 32 GB flash plus 512GB and it only felt marginally faster than a standard disk drive. You didn't notice serious performance boosts until you went completely flash.
So does Intel have a yield problem or are they still ramping up production facilities to make these in quantity? It's hard to see a system more convoluted than straight SATA or NVMe flash disk being that big of a deal. I think in order to make this product competitive it has to be offered at $/GB competitive with ordinary flash disks or only a small premium.