I just found this amazing feature in iPadOS 13. See those images above.
In iOS 13, we can connect iPhone, other iPad, or even iPod and import photos directly from them. I am not sure if this feature is available in iOS 12 but definitely something new for me.
I am aware that iOS could already import photos from cameras. But importing images from iOS devices might be a very interesting change.
On top of that, in the future version of iOS 13, user might be able to connect to iPhone Personal Hotspot using a USB cable instead of WiFi. To me this is far more reliable than WiFi. Maybe WiFi iPad is not a bad choice for me in the future.