What you've described are conveniences, which in essence was what my comment was about. A headphone jack is a convenience. It is inconvenient to use a dongle to convert from USB-C to 3.5mm, just as it is inconvenient to go down to your local government branch to change your address. You could do it, but you'd probably much rather just use your phone. You could ask the restaurant staff for a physical menu, but it's probably more convenient to scan the QR code.
I won't be able to pay in most parking places. There's no government office to show up at for that. I also don't think I can manage my business information in any offline way - the most manual form of that requires (electronically) signed forms to be sent via e-mail. So while I agree, some things you probably can do without, others in a 2023 Northern European society you really can't. If I wanted to live life with a dumbphone nowadays, I'd have to move to a less advanced part of the world.
Yours is the country that’s now vulnerable, not the "less developed third-world." No one should be depending on fragile insecure multiple-points of failure technology for 100% of life. You’re one invasion, terrorist/cyberattack, or solar flare away from armageddon.
Even just the power out for a few days after a storm and you’re done during that time. I can think of additional failure modes.
