There is absolutely no reason at all to tell the attackers the exact version of software you are running
There's a good reason to tell the attackers the version of the software: You can't know that the person you're telling is an attacker, and non-attackers have lots of good uses for that information. It's especially useful in diagnosing problems. It's also handy in release management.
I believe obscurity usually improves security. But that improvement does come at a cost.
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