Obsolescence - Wikipedia, the free encyclopedia
since we're defining things haha...there's exactly what we're talking about...
Yes, you should try reading your own link. FUNCTIONAL obsolescence is what is relevant, and people are arguing technical obsolescence which from a user perspective is often trivial.
Back to you VCR example, it's obsolete because you really can't rent VHS tapes anymore. I can still get plenty of good apps for 2.0 and Froyo on the D1. That's the difference between functional and technical obsolescence. Technical obsolescence is itself rather subjective - everything starts down that curve the day after it's bought but functional obsolescence is a much different animal.