Antigen not updating
Thus this is the reason Antigen is named after an Immunology term.
Essentially what you do is list plugins in your and it will automatically download them.
In fact, all of this is mentioned in the Motivation section of the README.
Antigen has a great set of features as of right now.
It has a great default library that turns on a lot of great zsh features that make it better for new users.
It allows you to run various commands such as updating all the plugins, clean up unused plugins, and more.
The configuration is super simple and it addresses all of the issues with oh-my-zsh.
This is great but a solution is being developed that addresses these problems. Antigen cites that it is directly inspired by Vundle, which is a great plugin manager for Vim.
Vundle was inspired by Pathogen which was the first plugin manager for Vim.