Because they think they know best, because they got to this point by doing what "we've always done and it worked" and because for a lot of them change isn't something to jump into lightly. Some of this reasoning is probably sound, running with new technology may have issues with stability, reliability and when you're dealing with mission-critial applications and people who have been trained for years to do something a certain way - it's not easy to change them overnight. However, I believe, with time they'll change their mind or... will simply be left behind.
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