A Store in Every Home

Will Amazon release a real tablet soon? That is, one with an ecosystem similar to Apple’s?
Andy Ihnatko makes a pretty good case for this.
However he goofs one point, his 6th and not most important:

6) Amazon has a retail channel that rivals Apple’s. There’s an Apple Store within a short drive of every home in America. Great. The Amazon Store is actually inside every home in America.
And Amazon is a lot less hidebound than Apple is on the “All customers must wear pants” shopping policy.

I only need to wear pants or a dress if I go to an Apple meatspace store. Apple also has a perfectly good store along with iTunes that I can access from anywhere one can access Amazon’s store.

Why is Berners-Lee Wrong About iTunes?

In raising some legitimate concerns about walled gardens being created on the internet Tim Berners-Lee says the following:

You can’t make a link to any information in the iTunes world — a song or information about a band. You can’t send that link to someone else to see. You are no longer on the Web. The iTunes world is centralized and walled off.

Except it appears that you can.
For example, and this is not an endorsement of this song, here is a link to Kush by Dr. Dre.
It sure looks to me like I can link to information about a song and send that link to someone else to see.
There may be other walled garden issues with iTunes but this does not appear to be one of them.
What am I missing?