The included audio interfaces got to a point where they're good enough for the conventional user. But that aside, Having an external interfaces, like we do now

The included audio interfaces got to a point where they're good enough for the conventional user. But that aside, Having an external interfaces, like we do now provides better and more modular options. Better latency, quality, DAC converters, additional inputs/outputs, etc. Focusrite, M-audio, Presonus, Motu, Behringer, Unversal Audio, the list goes on.