Because it contrasts something from 1979 with something from 2001 and fails to explain how this is a relevant example for the discussion.
It was a direct answer to that question, and IMO a good one. Some in this thread appear to feel that we inexorably move towards a disposable culture, and this is a clear counterexample.
How is directly answering a question with a counterexample not contributing to the discussion? I shouldn't be so annoyed at this, but I admit that I am.
IMHO there's nothing wrong with your original comment, except perhaps brevity. Maybe somebody was of the opinion that you needed to make the argument that a Walkman is simpler than an iPod.
How else can a downvoted commenter, and bystanders, learn?