SVGT 1.2: <image> does not support SVG

Greetings,

I found it peculiar that Section 5.7 <image> specifically disallows  
<image> tags from referencing whole external SVG files and instead  
suggests that content authors use <animation> instead for that  
purpose.  If implementors already have to support <animation>'s use  
of whole external SVG files, how can it be any harder for them to  
support whole SVG files as part of <image>?  I would encourage the  
working group to consider allowing <image> to reference entire  
external SVG documents.

Thanks,
Eric