The iPhone 18 and Duo models may not be enough for Apple (AAPL) to establish a net growth engine, argues Peter Andersen. Price fatigue is the key fulcrum to his thesis as he questions the runway for new products if costs continue to increase. Peter also addresses concerns that Apple's new touch MacBook will cause physical strain on consumers as well. While Peter sees signs of strength in margins, he issues caution when it comes to the Mag 7 stock's valuation.