More technically, this library can be used to send http requests via UrlFetchApp.fetch or UrlFetchApp.fetchAll, interacting with api endpoints in raw form. By bringing it down to a lowest layer on this platform, you get the following benefits:
All of the options, features, and abilities that are available. No compromises.
Ability to batch the requests in bulk. Performance can be significantly improved and run times lowered.
If you’re looking for a way to duck under the 6 minute limit to your scripts, the last bullet point should be particularly interesting.