Steve Jobs once famously said, "If you don't cannibalize yourself, someone else will." It was in reference to how the iPhone would take sales away from the iPod - a move that proved tremendously successful for Apple. The topic of cannibalization comes up often in the camera world.
Fast autofocus with face/eye detection; Same sensor; processor as X-T3; 10-bit 4K video output; Engaging user experience; Fast continuous shooting speed
No in-body image stabilization; Some ergonomic compromises; Small image buffer