I may be one of the last hangers-on for this issue, but: my Android phone has a headphone port! That was non-negotiable for me last time I got a new phone. Earbuds do not stay in my ears, are super uncomfortable, and I don't want to charge a wireless headset or mess with an adapter all the time. I have cheap wired headphones for going out and about that I don't lose when they fall out because the wire catches them, and really nice wired headphones at home that are much better quality than wireless ones. My car also has a 3.5 mm hookup that sounds a lot better than Bluetooth audio.
Besides that: Having more customization and control. Firefox + adblockers and other extensions. ReVanced for YouTube. Easier access to the phone's storage and files. Being able to block ads adds so much quality of life.
I literally can't keep the wireless earbuds in! I don't know if my ears are too small or weirdly shaped on the inside or what. Sometimes I can kind of wedge them in for a minute, but only by having them actively digging into the sides of my ear. That hurts and it still falls out as soon as I move my head.
My current phone doesn't have a micro SD card slot, but that's another improvement I would really like to have. I like to keep a lot of pictures and files on my phone and it would be great to be able to upgrade the storage as it fills up.