SVG fonts on the Web

Assuming browsers support downloadable Truetype/Opentype fonts via CSS
@font-face, and that these fonts can be embedded directly in the document
using data: URLs, in what situations would you want to use SVG fonts on the
Web? Has anyone got any real use-cases that cannot be suitably addressed by
TTF/OTF?

Rob
-- 
"He was pierced for our transgressions, he was crushed for our iniquities;
the punishment that brought us peace was upon him, and by his wounds we are
healed. We all, like sheep, have gone astray, each of us has turned to his
own way; and the LORD has laid on him the iniquity of us all." [Isaiah
53:5-6]