I remember the biggest "missing features" of the iPhone people asked for were MMS and OBEX, along with 3G.

I also remember Apple had cared for most missing things by the iPhone 3G respectively iOS 3. Then they improved photo quality, speed and videos until the iPhone 4 respectively iOS 4/5. Similar things can be said about the iPad 2.

After that, I've had the feeling the product didn't improve anymore, because there was nothing actually useful left to add. I've used my iPhone 4 for 10 years, while Apple enjoyed adding more complexity without true benefit, except maybe the file manager and on-device image editing.