It's not just that, they made subpar decisions.
First, they branded the 16/32GB modules under the name "Optane Memory", but they were HDD accelerators, with whole list of caveats such as locking your system out totally if it failed. Instead, it should have lived up to the name and acted as "Slow Memory" complementing DRAM as an extension. It's not like the infrastructure to do this didn't exist. Their datacenter SSD had a software called Memory Drive, which did precisely that. That would have had lot more value than an HDD accelerator and more justified the price. RAM isn't just for performance. At certain point there's a hard line where you have compatibility issues or the performance plummets. The Memory Drive + Optane Memory would have worked significantly to alleviate this at a much lower cost.
Second, they should have worked with AMD to make sure the PM modules with with them. It should have been the goal to make the PM DIMMs fully compatible with DIMMs, where the only difference is the underlying technology, and to get it recognized easy as certifying other DRAM modules. While it seems contradictory to work with a competitor, it would serve to prop you up during times when your own product is uncompetitive and you would partially offset that by the competitor doing well and buying your other products. That would increase volume, which would allow them to gain more real world experience, lower cost. It would have been perfect TODAY.
Third, the goal should have been moving to PC as quickly as possible. 128GB modules for $300.
The big issue with Intel is that they are so into trying to optimizing 1% margin, they lose the sight of big picture. Work with everyone, competitor or not, which would serve to reduce the valleys and peaks of revenue and stabilize the business. They at least did better with the WiFi business, but mainly because it was so ubiquitous in the first place, people would often ditch Marvell and AMD-branded ones to install Intel's. But same could have been applied to Optane.
Without this mindset changing, Intel's pitfalls will continue in the future. Novalake, Unified Core, it doesn't matter. Are the fundamentals fixed where they have a laser-focus on 1% margins/revenue and proprietary interfaces to lock out competition? Without changing this, the long term trajectory for Intel is still a decline, eventually into bankruptcy. This includes Lip "No products under 50% margin" Bu Tan.