Remember when Steve updated the Steve grid to include the Mac Mini and MacBook Air.The optimal Mac lineup, MacBook or desktop fits the Steve grid - one consumer option (plastic, cheaper), and one pro option (higher performance and premium materials). People either want cheap and functional or performance and damn the expense.
Same is true for iPads, and for iPhones.
Can offer with different screen sizes and customised upgrade options, but no need to overly expand and complicate the core lineup.
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