Do I need a new garage door opener to make my garage smart?

No. For most pre-2015 openers and many newer ones, a retrofit controller like the Meross or Chamberlain myQ hub adds Wi-Fi and app control for $30–$90 without replacing the motor. Full replacement openers like Chamberlain's belt-drive units only make sense if your existing opener is loud, old, or lacks battery backup mandated in some states like California.