auto ISO on 7D with flash

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I've just figured out the 7D has auto ISO....

Why have Canon crippled this feature to lock ISO onto ISO 400 when using Flash/speedlight ?
 
I've just figured out the 7D has auto ISO....

Why have Canon crippled this feature to lock ISO onto ISO 400 when using Flash/speedlight ?

Because with flash you can vary the brightness of the light very easily to control exposure, which you cannot with daylight.

In most situations, that's a better option, but all auto modes have their limitations.
 
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