Cat6 installation Las Vegas: planning your installation
Wi-Fi has improved enormously, but it still shares airtime, degrades through stucco and block walls, and drops under load. A cable does not. For anything stationary — a desk, a media console, a console or gaming PC, an NVR, a TV that streams 4K — a hardwired drop removes an entire category of problems.
Ethernet also carries power. Power over Ethernet lets a single cable run both data and power to a Wi-Fi access point, a camera or a door reader, which is why almost every serious camera and Wi-Fi install starts with cable rather than wireless.