A full 3D game -- renderer, physics engine, scripting runtime -- exported to WebAssembly is 35MB. The default Node.js Docker image is hundreds of MB, pulled 19 million times last week.
Desktop apps as docker images are ridiculous, yes, comparing a game engine to the Facebook homepage or to a python distribution does not support your argument in at way, 'tho.
Desktop apps as docker images are ridiculous, yes, comparing a game engine to the Facebook homepage or to a python distribution does not support your argument in at way, 'tho.