The tripod mount has been a standard for decades and decades.

The phone headphone jack fractured into competing standards years ago. Works fine for listening, but once you want to use a microphone you're dealing with different pinouts for different manufacturers, balkanized auto detection and signaling, incompatible plugs sizing, grounding issues with the phone case, etc. It wasn't a pristine situation when Apple left it behind.

This is true, but ultimately they are all variations on the 1/4" phone plug, which has been a standard across multiple industries since the advent of the telephone. Adding another ring to a TRS, or changing the pinout, is a minor variation compared to Apple's alternative. The phone plug is so ubiquitous that I think the comparison is valid.

My next phone will also have a headphone socket.