What is the practical difference between the Nuclide package for Atom and the Atom-IDE package? I'm only a novice Python programmer, and all I can piece together is that Atom-IDE is built from Nuclide, but they both seem to have similar features and language support.
Atom IDE contains a subset of Nuclide’s functionality. Specifically, it contains the set of features needed to support language servers (https://microsoft.github.io/language-server-protocol/). It’s maintained by the Nuclide team.
Source: I am a member of the Nuclide team.