If your looking for a good iPhone you should get the iPhone 8 plus.
-Its a good size phone
-it’s water and dust resistant
-Wireless charging
-3 color choices: space gray, silver, gold
-Louder, more dynamic stereo speakers.
So those are the nice qualities of the iPhone 8 plus.
This relates to engineering because the creators of the iPhone would have had to figure out how to make a new, better iPhone with new features for users.
https://www.apple.com/iphone-8/