Extend just enough - when your HDMI cable can't quite reach or bend to where you want it to go
Protect HDMI ports from wear - have to plug and unplug devices often, use a short extension cable so that wears out instead of the ports on your more expensive devices
Flexible and thin but still powerful - full 4K@60 HDMI 2.0 support, 18Gbps bandwidth, HDCP 2.2, 4: 2: 0 and 4: 4: 4 Chroma