Wired networks offer significant security advantages over WiFi networks. WiFi have a potential for anyone in signal range to have access to it. While networks may require passwords to connect, if those credentials are stolen, anyone in a nearby building or vehicle can potentially connect to your WiFi network and be difficult to distinguish from a legitimate user.
Wired networks still require some security work to be completely safe, but connecting to them usually requires physical access to a network port, meaning intruders need to enter your house or office to connect an unauthorised device physically. That's an added, risky step that not all hackers are willing to take, especially in a well-secured property.
Wired networks offer superior reliability and stability once the whole installation is completed. Its signal will never be influenced by other networks, with no 'dark spots' whatsoever.
Whereas WiFi relies on radio frequencies and they can be interrupted by some appliances and internal walls causing 'Dark Spots' where either the signal is either too weak or no existent to activate a controller.
Wired networks are ideal for larger homes, WiFi signals have a defined distance from the router depending on the WiFi router's quality.
The speed can be considerably faster and more reliable on wired networks. It's the perfect option for new build or significant development projects whereby installation of cables in walls offers all the positives and once completed will be discreet enough that you will not know it is there. Once installed, it generally offers better service to wired home automation components that utilising wireless components.