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
The thing is, bluetooth is not a perfect solution. It drains battery, is patchy and has variable audio quality, creates yet another thing to remember to charge (children are rubbish at remembering so just end up blaring awful videos on long journeys for everyone to hear), you can have issues with connecting devices that are literally inches away, and crucially - they are not mutually exclusive. I currently have a Samsung A52S which has a 3.5mm jack as well as Bluetooth technology. Even phones 10 years ago offered both. They are just removing an option many people still opt to use - especially those who can't afford good quality expensive wireless headphones.
It is a cheap, universal option. Bluetooth technology is expensive and have diminishing battery performance. I've accidentally put £5 wired headphones through the wash before and still work perfectly. They last an entire plane trip UK to Australia without running out. If I am doing a task that requires my hands and don't want to snag, I have wireless ones I can use.
It's not something that needs replacing. I don't need my phone to be thinner than 3.5mm, I m going to put a chunky protective case on it regardless.
It's like getting rid of public transport because most people drive.