Smartphones replaced separate entertainment devices by combining music, games,...

https://iris-wiki.win/index.php/Why_Does_Synchronization_Between_Devices_Matter_If_I_Mostly_Use_My_Phone%3F

Smartphones replaced separate entertainment devices by combining music, games, videos, and more into one handy tool you carry everywhere. Mobile-first design needs to make sure apps load quickly and navigation feels natural on smaller screens