Also, many people want to run Linux on their phone. About 7 in 10 smart phones run Linux, and smart phones are devices billions of humans use every day.
This is as far from the mainstream as you can possibly get.
Come September it will have been a decade since Apple dropped the headphone port - the world has moved on
Do an experiment. Jump in a pool with both your iPhone and your MacBook and see which one works when you get out.