We're nowhere near ‘post-Moore’ in persistent storage, though. Although Dennard scaling for CPUs has faltered (if not Moore proper), storage is still getting faster and denser at the same time... it just does the speed upgrades in discrete jumps. SSDs were massively faster than HDDs, and when Optane DIMMs actually become available, those will be another huge factor faster than SSDs. (And if not Optane, then QuantX or MRAM or NRAM or ReRAM or...)