Are you kidding me, that certainly isn't a statement that I would take offense to. My intention for providing that information was to give folks perspective on the company policies. I would like to point out that the personal greeting is only if time permits (i.e. EWR-BOS) and it could also be a farewell.
I think your right, a longer flight certainly enables the crew to become better aquatinted with the customers and thus be more inclined to personalize the closing. I don't think many of my colleagues (including me) follow this policy, regardless of seniority.
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