The article does not mention that one major thing MS-DOS improved on was the filesystem. CP/M had no concept of a hierarchical filesystem, instead the filesystem was flat and only divided into a set of numbered user areas.
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Neither did MS-DOS until version 2.0. Both CP/M and MS-DOS 1.0 were targeted at computers which almost exclusively utilized only small capacity floppy drives for which a hierarchical filesystem made little sense. CP/M was already basically dead by the time hard drives became cheap enough for the type of systems CP/M targeted. If it had not been then certainly support for a hierarchical filesystem would have been added.