We used to have earbuds that don't need to be charged because they had a headphone jack, didn't get lost so easily because they had a cord attached to a headphone jack, never lost the bluetooth connection because they had a headphone jack, and they cost less because they had a headphone jack. https://bsky.app/profile/daisyfm.bsky.social/post/3l3mfjc6sn62k
These jacks are still in every other audio device. They were removed from phones to force BT usage, which Google needs for their profiling telemetry network and Apple for their Find my Device thing. God forbid someone turns BT off or even decides they would prefer a phone without BT entirely. There is no other reason and how people prefer to listen to music has nothing to do with the subject.
Waterproofing is very difficult with a headphone jack. You'll notice virtually every single phone with a headphone jack is 'splash resistant' while many without are able to survive being submerged. It also saves a relatively large amount of internal space, for something that easy to move external with an adapter.
If we're talking about adding back in older communication standards, I would personally prefer an am/fm receiver and IR blaster; it would be cool to use my phone like a universal remote.
Samsung had headphone jack until note 10 and ip67/68 rating since s5. Similar story with other brands. What you described are two separate trends.
Cheap phones still have fm radio support. Pretty sure it's disabled in software in everything else, and you need cabled headphones to serve as an antenna either way (not sure if usb c works).
That makes me wonder how the Zune pulled of having a pretty solid and clear radio without an antenna. Must have had one wrapped around the inner casing or something.