Because silverlight takes all of 15 seconds to download and install, and Visual F# is an hour+ to install, plus a couple hundred megabytes of additional assets?
That said, the Azure portal never seemed to work that great for me, even if I was running Silverlight on a Windows box. The HTML5 portal actually seems worse, to me, though.
You might be interested in this, the azure-cli tools: http://blogs.msdn.com/b/windowsazure/archive/2012/12/19/azur...
I don't know how you can find the new portal to be worse. That Silverlight portal was one of the single worst thing I've ever used in my life. The HTML5 portal is quite nice, it uses the same endpoints the VS extension uses, giving them a single point of entry for management actions. I'm happy with the management portal now but am already aware of the CLI tools too.