A simple way for any audio output device following the global standard used for the past 25 years to output sound directly from the device. Failure rate is one tenth that of any other external port. Use is so widespread in home audio that it's absence is seen as a detractor.
The original Walkman has a 3.5mm jack. That's how far back this standard has been in common use.
I can't comprehend why anyone puts up with not having an audio jack.