These things aren't deal-breakers they're conveniences for me. It's easy to transfer stuff to a new phone with an SD card, if your old phones screen dies (has happened to me twice over the years) you can still easily move your stuff over to the new phone.
My last phone only had 64gb of storage. I always have some audio-books and podcasts on my phone for when I go to very rural areas with bad reception like the lake. Up until the phone I bought this year with 256gb I would have been always cramped for space without an SD card.
Why use an adapter if you don't have to, that's just one more thing to go wrong or get in the way. I had a pixel for a while and I did use an adapter for my headphones. They were awkwardly placed with the adapter, if the usb port broke because of the headphone adapter being awkwardly placed I couldn't charge the phone. If I broke a headphone jack I'm just inconvenienced.
I don't understand why someone being content using older technology bothers you so much that you want them to defend their choices.
Even if the $800-$1000 phones had those features I wouldn't spend that much on a phone. If only the flagships had those features I'd go without. Thy're nice to have but not must haves.
Do you also get annoyed with people who play retro games or listen to vinyl records? Do you wonder why people drive classic cars or wear analog watches?
They're putting fentanyl in the cocaine now.