This is a glorified wrapper written around existing package managers. I wouldn't call that useful.

No, this is a reimplementation of basically every major package server. Now, instead of hosting your Ruby gems on rubygems, NPM packages on the NPM registry, and Python packages on PyPI, you can host them directly alongside your source code. The tools by which you access these package registries are the same, but they can now be backed directly by GitHub.

Which is a glorified wrapper. Why on earth would you make a decision to lock up all of your eggs in the Microsoft basket? Diversity is a good thing. Just look at what's happened to the web industry with Chrome, and now it's basically too late.

I couldn't agree more with jonny383. Why so many people consider centralizing everything as always and universally a good thing? Some people just don't seem to want to learn from history.

Some short-term conveniences come at a very high price in the long run.