Sorry for dropping the ball on this.

I read the spec as: if your device has two camera's "there
may exist valid reasons in particular circumstances"[1] not to provide UI for the user to pick one, 
"but the full implications must be understood and carefully weighed before choosing a different course."[1]

So basically, there might be might be situations where it's OK not to offer this option to the user and still be spec compliant. So this brings up a methodology question of how we should deal with this in practice.

This has been discussed in the past[2].

I'm going to bring it back up the public-test-infra@ mailing list and propose a resolution.

Sounds good?

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[1] http://www.ietf.org/rfc/rfc2119.txt
[2] http://lists.w3.org/Archives/Public/public-webapps/2011JulSep/0053.html