Apple has defended its decision to leave most iPhone owners behind when it pushes ahead with newly announced AI-powered features, set to roll out later this year only on future iPhones and premium models from the most recent generation. AI boss John Giannandrea said this move had purely technical reasons, explaining in a live interview on The Talk Show podcast on Tuesday, that the AI software required more powerful hardware. The AI models could theoretically also run on older phones, he admitted, but argued they would be too slow to be useful. Apple announced an AI offensive earlier in the wee…