Rather, it is not useful to you; do you work in an environment with a mix of OSes, like many of our IT brethren here?
If you're a traveling worker (such as I am, a self-employed technical consultant) who spends lots of time at your various client's offices, are you 100% certain that no one there has an Ubuntu install and would not be interested in the contents of your phone?
Just because a security hole does not apply to your specific situation does not mean it is a non-issue to everyone else.
Then you should post your FUD to sites that have millions of users and generate millions of responses, not some FR thread that will generate at most a hundred individual responses.
And old adage; No matter how pretty the can, if the dog won't eat it, it won't sell.