Apple stock is down 15% year to date, but most Wall Street analysts are optimistic ahead of the company's upcoming earnings report.Apple (AAPL -0.08%) is no longer the most valuable company in the world. It ceded the title to Microsoft in May, then slipped behind Nvidia in June. Apple stock has dropped 15% year to date over concerns about tariffs and its artificial intelligence strategy.Nevertheless, most Wall Street analysts rate Apple stock a buy ahead of its third-quarter financial report, which is due a ...