Pretty much nothing i use my phone for can be done on a flip phone. Smartphone is no distraction for me - I just use it when I need it to do something for me.
maps - occasionally GPS.
mp3 player
mp4s watching on long train / bus rides or when camping.
large sd card (500gb)
memrise/ language learning app.
occasionally guitar tuner
occasionally internet is useful for checking events, buying tickets, checking for hotels and stuff.
occasionally checking emails.
occasionally playing mindustry (when i want my battery to die).
I don't carry a laptop most of the time that i'd need for most of that stuff above. TBH - I can't use many other apps anyway because I don't want GPS or microG installed - so I'm mostly just f-droid apps.
Edit - i'd also prefer something like simpleX to SMS, but I don't actually know anyone else who uses it - so not an issue really. I just have to SMS.