Cohesion is achieved when the degree of complexity is determined by both domain and audience, so Photoshop's relative complexity and Pixelmator's relative simplicity are both fine - in each case the domain is satisfactorily handled for the needs of the respective audience. They're both cohesive tools. Now if Photoshop decided to throw in a chat client (hello gmail), we'd be having a different conversation.
However, if the author is actually advocating breaking up Photoshop into a thousand pluggable little tools that everyone would have to piecemeal assemble into some sort of shared "workspace," that's where we (and most non-geeks) part company.
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