[Rails] Why Rails doesn't use their own technologies?

I'm reading now about assets in Rails. Because I got errors on Heroku
that my assets are not pre-compiled. On local machine everything works
fine, on Heroku they are not pre-complied.

The guide says:
>> Starting with version 3.1, Rails defaults to concatenating all JavaScript
>> files into one master .js file and all CSS files into one master .css
>> file.
>> In production, Rails inserts an MD5 fingerprint into each filename so that
>> the file is cached by the web browser.

Then I decide to see Rials sites in console:
http://guides.rubyonrails.org/
http://edgeapi.rubyonrails.org/
http://edgeguides.rubyonrails.org/
http://edgeguides.rubyonrails.org/

No any fingerprints in assets names. They are not even from Sprockets
(no any ?body=1 at the end).

So why Rails offers to others (sets as defaults!) what they do not use
themselves?

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