New post on Paul Irish blog is answer for a question: Do websites need to look exactly the same in every browser?
The best analogy is to explain it like old black&white TV's and new HD ones. Do any TV station still use only blask&white to serve exactly the same to all users? Of course no!
To read more about how to explain it to customers, and why you should think how to make your site fast, not identical: Tiered, Adaptive Front-end Experiences
Most of ideas are from Nicholas Zakas presentation:
Progressive Enhancement 2.0 (Conference Agnostic)
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