I think you don't realize that the average age of the WoW player is in the 20s.
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The point he made was that LFR was too easy. It doesn't teach a new player anything valuable. Right now, LFR is still too easy and doesn't teach anything valuable, but in addition to that it takes like twice as long to run in some cases.
And I'm not sure what you think is wrong with his view of Classic/BC. Seems fairly accurate to me. Nor do I see how that's quite relevant.