I doubt you can have performance AND low cost AND no endurance problems.
A RAM chip can't say "hang on a minute, I need to sort out my fragmentation problem". It must deliver the data at however many clock cycles it is after the command.
So I think this appears as a (memory-mapped) storage device in a DIMM slot rather than an M.2 or PCIe slot and cannot be used as RAM. Obviously unlike normal storage devices can't do interrupts either so lots of polling needed.