I presume DirectStorage and RTX IO are only capable to decompress specific and probably simpler easier to implement formats. You have to consider, what good is a mediocre compression format, when I have two cores idle that I could occupy with say running a ZStd decompressor on better compressed data. Just because DirectStorage/etc avoids any direct CPU involvement via DMA, doesn't mean the memory controller is any less busy (cache coherency BS). If I have spare CPU cycles, I might as well continue to run the decompression on the CPU. Things like ZStd are super-fast (at least in decompression), regardless. Anyone that'd care about DirectStorage and/or has a GPU capable, probably also has a half-decent CPU.