I really miss the headphone jack! I can't express this enough. I've been without a headphone jack on my phone for over a year now when I bought my iPhone 7. I used the dongle for a while and it was fine, but what irritated me is that I couldn't charge my phone and connect to my cars sound system at the same time. I know people will say that I need a double dongle which is sold on Amazon, but most of those didn't function after Apple started doing the updates to squash use of 3rd party adapters in favor of their own which are astronomical in price compared to others. I know many new cars will connect to apple devices via USB and Bluetooth now seamlessly, but at this point it's easier to replace a phone than it is a car. By the way, I'm not a fan of dongles. They get lost, broken, worn out very quickly in the shuffle of life.
For a buttonless phone. All I can say is that software engineers have their work cut out for them. To develop an OS that wont require an old fashion 'Hard Restart' to me seems a 'pipe dream', but I'm optimistic that someone with enough smarts can create something like LCARSS on star trek that will always work.