So this is for when Apple has come out with a new feature. It can be current, or in the past. The rule is that it has to be a feature you used when it first came out over everything else. Let’s have some fun with this!
For me it would be the fingerprint sensor. After years of having to use the passcode, being able to have my phone in my pocket and unlock it without looking and using it with one hand was godsend!
Retina Display! I remember thinking it wasn’t a big deal when it was announced. Then I got my iPhone 4 and was blown away by how good the screen was compared to my iPhone 3G.