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Re:Rails API is coming to Rails 5 by steveklabnik on Tuesday April 21, 2015 @01:24PM (#9415566)
There's a lengthy explanation here: https://github.com/rails-api/rails-api#why-use-rails-for-jso...

EDIT: sorry, I mis-read your post. This is just "Why Rails and not Sinatra," not "this is easy enough to do on its own, why bother."

I wasn't directly involved in the decision, so I cant' tell you, to be honest.

Re:Rails API is coming to Rails 5 by catshirt on Tuesday April 21, 2015 @01:33PM (#9415636)
this justifies the library's existence but does not justify it's inclusion upstream.
Re:Rails API is coming to Rails 5 by 1qaz2wsx3edc on Tuesday April 21, 2015 @01:38PM (#9415672)
Because Rails has become bloatware and has been since they lost sight of the future of the web and stagnated on innovating...