Looks like Docker, node/npm, ruby/gems, java/maven, and nuget... but no Python? Seems an odd choice for the one to leave out.
people may be reading too much into this. notice there is no go either? maybe because we often tend to pip install and go get directly from github repos and releases? so whether they are working on proper integration or not, nothing is being missed here.
Installing directly from github is possible, but it works ok for a one off, if you have a package with your own dependencies then that doesn't scale.
It also covers source installations it doesn't work well for compiled.