I believe the whole idea, beyond pure speed of RAM vs SSDs, is they are promoting a programming 'model' where you bypass the operating system I/O (transiting via pages/blocks) and instead directly read/write data (via bytes) to the memory from the application. Which could be useful for particular usecases / subsets of data.
They mention write cycles in the article...
> The existing enterprise Optane SSD DC P4800X initially launched with a write endurance rating of 30 drive writes per day (DWPD) for three years, and when it hit widespread availability Intel extended that to 30 DWPD for five years. Intel is now preparing to introduce new Optane SSDs with a 60 DWPD rating
They mention write cycles in the article...
> The existing enterprise Optane SSD DC P4800X initially launched with a write endurance rating of 30 drive writes per day (DWPD) for three years, and when it hit widespread availability Intel extended that to 30 DWPD for five years. Intel is now preparing to introduce new Optane SSDs with a 60 DWPD rating