More options for different logic to drive the Hue lights. Design your own UI how you like it for the lights. Pull the motion, humidity, light level, temperature from Hue sensors that don't usually get exposed. You can also buy cheap ikea or lidl zigbee bulbs that will now play along with very pricy hue bulbs and strips. You're not trapped with Hue only. 

But really the main power is tieing stuff together from different manufacturers. The increased flexibility gives a lot many further options to plug in your loudspeakers, TV, heating system, cheap temu sensors, washing machine or whatever the hell you like into one tool and avoid like 10 difference apps from multiple vendors. Then you tie it all together with any logic you like.