"Micron can [PR bull] maximiz[ing] the benefits for [..] shareholders"
That there is the real reason, as usual : money, profit and shareholder ROI.
Customers are just the inconvenience that companies put up with to get money.
Intel and Micron Technology will dissolve the partnership that gave the world 3D XPoint storage-class memory. Identically-worded statements from both companies said “The companies have agreed to complete joint development for the second generation of 3D XPoint technology, which is expected to occur in the first half of 2019. …
The throughput, latency, and endurance are still nowhere near where they need to be for it to work as initially promised. Considering Intel's seemingly continuous execution problems these days, it's possible that Micron doesn't see a reasonable way forward with the technology.