Apple’s big push into AI – which the company insists stands for “Apple Intelligence” – could spark an upgrade “supercycle”, with the intense processing requirements for the souped-up Siri limiting it to only the most powerful iPhones currently on the market.The company risks angering users who will update to iOS 18 this autumn to discover that even a brand-new iPhone 15 is unable to run features such as automatic transcription, image generation and a smarter, more conversational voice assistant.Apple’s new ...