silverlight accessibility quick start

I came across this post on silverlight accessibility quick start

While this is better than the mostly nothing that is out there in terms of making silverlight apps accessible, it falls far short of providing developers with effective ways/guidance/tips and tricks for making silverlight apps accessible.
What I don't understand is why the silverlight team doesn't fix very basic things like the textblock control not being accessible!!! either make it accessible or get rid of the control. The guidance that use a read only textbox instead just doesn't make sense to me and definitely much less to all those developers who have little or no exposure to accessibility related issues.