Why Do The Latest Versions Of Soundtrack and Soundtrack Pro Use .caf Files?

About 3 years ago Soundtrack and Soundtrack Pro started using .caf files instead of .aif ones.
The .caf files appear to take up more space than .aif and of course need rendering before they can be used in FCE/FCP.
So what is the logic behind their use?
I would add that I have skimmed through several articles which claim they have advantages ..... which I can't understand.
I only know that when used normally in FCE/FCP they seem to me a backward step, requiring rendering - almost like using .mp3 but without the space-saving features.
Message was edited by: Ian R. Brown

Here's a link from Apple:
http://developer.apple.com/DOCUMENTATION/MusicAudio/Reference/CAFSpec/CAFoverview/CAFoverview.html
It touts "unrestricted file size" as one advantage of CAFs. Has any of us ever exceeded the supposed 4GB limit of AIF files?? This is from the page linked above:
"Whereas AIFF, AIFF-C, and WAV files are limited in size to 4 gigabytes, which might represent as little as 15 minutes of audio, CAF files use 64-bit file offsets, eliminating practical limits. A standard CAF file can hold audio data with a playback duration of hundreds of years."

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