Our personal license version of the game uses online multiplayer through steam matchmaking. While that is good for home players especially if the internet connection is strong, for our events, we are using public wifi or a wifi dongle which is not optimal and reliable for multiplayer connectivity.
LAN multiplayer without using steam was therefore a must-have feature of the commercial license version of the game, so that connection is reliable and latency is low for a satisfying experience.
Another benefit for LAN is it allows you to start up your game without even requiring to connect to the internet and also not having to launch your Steam account. (Steam VR will automatically be started when the game is launch without Steam launching or you can use it in Steam Offline mode). This means faster setup time and less headache (Steam updates!)