Same here. My current method is a self hosted website on my home network which showcases all available games, followed by a bash script download that will automatically generate the yml file for Lutris to fully install any of my 200+ games.
Whilst this is currently the best way I’ve found for my setup this app seems like the perfect thing to potentially swap to, if Linux was supported.
Just install the lib32-libnm package. The one Steam is supplying is outdated with the new libgudev 238-1, by installing your own lib32-libnm your system will use that over Steams one and it should launch fine.