Perfect for carrying it in a pocket sure, not at all great for carrying it around in a hand. A compact camera is wider but shorter in two other dimensions, so it's easier to carry.

True. Hand grip with shutter trigger exactly where my finger rests — can't beat that ergo.

Taking photo with phone is utter horrible. I admittedly can't take a decent selfie with one hand. Even holding chopstick is easier.

Are you using the volume buttons to take a picture? I sometimes find that more ergonomic than tapping the screen.

I use the touch button if holding with one hand. The dedicated button for the shutter equivalent makes the photo shaky! How could that with one hand?

In my main camera use case the "gopro" form factor has much better ergonomics than a phone, by a wide margin. Unfortunately, that market is wildly underserved because all existing cameras in that form factor barely consider stills even an afterthought, if they consider it at all. I'd pay real money for a camera that is on par with phones but does not come with an almost face-sized TV attached.

(I use an RX-0, which at first glance seems to fit that bill, but doesn't really: it's an extremely small movie camera that only pretends to be a very small compact for addressing a wider audience than it deserves)