Biggest thing though, they broke the keyboard. Thought I was losing my mind after years of using a 6, 6S, 12 mini and still mistyping horribly. Then I picked up my iPhone 5 that hadn't been touched in years since ATT banned it, so there's no way I'm used to it... Instantly typed way faster with 0 mistakes. I'm not the only one, there must be some Ba Sing Se type of denial going on at Apple with the keyboard.
If it's so bad, why am I even using it? I'm kinda not. I use my laptop whenever possible now. I call more often than texting on my phone, and on speakerphone instead of earbuds. It didn't get fixed, just had to adapt. And all of this is practicality, not even touching how special the old iPhone felt.
There's easy jailbreak options to bypass the activation for those and have a functional device, nowdays.