Phil de Terlizzi likens today's rapid proliferation of smartphone apps to the widespread use of remote controls for TVs and cable boxes that still clutter many coffee tables more than 65 years after the first ones hit the market. As consumers have an increasingly bewildering number of choices of "smart" devices for the home, they are faced with a fundamental decision- install them on a do-it-yourself basis and deal with the challenges of integrating them, or hire an installer offering a holistic system like Control4, Crestron, Savant or AMX, the latter owned by Stamford-based Harman International Industries.