I don't know the answer, but a sibling post confirmed by suspicion: It allows you to run games in a container without having to set it up yourself. If you want

I don't know the answer, but a sibling post confirmed by suspicion: It allows you to run games in a container without having to set it up yourself. If you want to run Windows games using Steam on Linux, you have to have a bunch of libraries available which you will almost certainly not use in your normal day to day activities. Having the software in a container means that all those libraries are bundled into the game distribution and you don't need to maintain them yourself.