The Moondrop MIAD 01 is one of the most distinctive Android devices of 2024 thus far. It has a 4.4mm headphone jack to go with the more conventional 3.5mm type. Furthermore, it seems it might be as appealing to teardown enthusiasts as well as audiophiles, and may, therefore, also be easier to repair than most modern smartphones.
The practical reason people use balanced jacks is because they push more power which allows you to use headphones with lower sensitivity. I have a few pairs myself that would benefit from this, they have relatively low ohm ratings so the high impedance setting on my V60 doesn’t get triggered when I plug them in and they are very quiet.