That no back button issue is only a matter of getting used to. As mentioned by others, you can swipe left or right to go back or forward on certain apps. Also, many things you could do on an android doesn’t work on an iPhone and you might get annoyed at first but after a while you get used to it. Once you really understand how the phone works and all its tips and tricks, you’ll start to realize how easy it is.
Only setback for me is many functions are not available in our region. Might be nitpicking to some, but it annoys me that I cannot use the phone to its full potential.