I am not talking about app but rather the general deficiencies of ios ui wrt
Your points replied to:
1. Disjointed navigation between apps (non stacked based)
(This is your preference I don't like stacked, like it is in safari I prefer the card layout)
2. No global back and task buttons
(You just swipe left from the left side of the screen its much more simple than swiping up the virtual controls to then click back)
3. Convoluted Settings implementation
(Convoluted compared to Android??? Wow. Android has the most messy settings menu i've ever seen. Can hardly find what I'm looking for, again showing More isn't better)
4. No support for shortcuts
(Short cuts for what? You're most used apps show up when you pull down on the screen for easy access)
5. Slower scrolling rate (I haven't had any issues with scrolling speed on either devices.)
6. No USB host support (Something I don't need)
7. No user accessable file system. (The file system is something I don't like on android)
It just shows you preference is rule of thumb here. You like what you like, I've never knocked anyone who uses android it doesn't bother me I don't care. I prefer iOS and therefore continue to use iPhone. I tried the S8 cause i loved its design an OLED screen but android was hard to adjust to.