I think all A8 devices and forward will get iOS 13. Maybe even A7 since it's 64-bit, but that's unlikely.
My wishlist mostly concerns iPad features, not iPhone. I am pretty satisfied with iOS on iPhone but miss some features. However, on iPad I really have many complaints.
For iPhone:
1. Dark mode
2. Default apps
3. Volume HUD not intrusive
4. A real update of the built-in keyboard, it is way behind the competition like GBoard (quicktype that was released with what iOS 8 or smth is still not available in Sweden)
5. Always on display for OLED devices
6. Power off should require Face/Touch ID or passcode
For iPad (in addition to those for iPhone):
1. Tabs for all productivity apps
2. Multiple windows side-by-side for apps, so for example Pages can show two documents simultaneously (like Safari has today)
3. Desktop class browser
4. Support for external storage via lightning/USB-C
5. A complete overhaul of the homescreen to make it more pro like the Mac, perhaps with a tool bar
6. Added keyboard shortcuts to bring it on par with the Mac, that way many things can be executed just by keyboard commands
7. Faster/different animations when putting apps side-by-side
8. Files app more options and get rid of that stupid tap and hold black toolbar and get something quicker. Previews for files like Finder on the Mac
9. Let us play audio from two sources at once, like music and a YouTube video at the same time
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I'll settle for the phone ALWAYS using the keyboard I select. I have the Swiftkey keyboard, but it does not always display.
Just delete the Apple keyboard and keep just your keyboard of choice (and emoji keyboard if you want). The Apple keyboard will still display when you tap password text boxes etc.
Works for me with GBoard.