Well, for disk access, it certainly was an OS. As for more powerful? Nah. Not sure how anyone could make that case given that the Unices of the time were alread

Well, for disk access, it certainly was an OS. As for more powerful? Nah. Not sure how anyone could make that case given that the Unices of the time were already multi-user multi-tasking systems. Given the hardware DOS ran on, it had to be as small as it was, because the hardware itself didn't have the juice or the architecture to handle multitasking. When the hardware improved, multitasking became a necessity, and thus the need for more hardware abstraction, etc., in other words, a full OS.