"Enable the implementation of new/modern user interfaces without any modifications to the core source.
"Improve the extensibility power with a new plugin architecture based on coprocesses. Plugins will be written in any programming language without any explicit support from the editor. "
It is exactly designed to be a playground for new features, but with the goal of them not having to be in the core.
Where did you get that idea? When I read the project page (https://github.com/neovim/neovim), two of the explicit goals are:
"Enable the implementation of new/modern user interfaces without any modifications to the core source.
"Improve the extensibility power with a new plugin architecture based on coprocesses. Plugins will be written in any programming language without any explicit support from the editor. "
It is exactly designed to be a playground for new features, but with the goal of them not having to be in the core.