No. That's a vast oversimplification, and not helpful at all.
You absolutely should upgrade if you want to reduce the problem. In Atlassian applications (like most others) stack traces only go to users when the application is not coded to catch them properly and present something nicer. Upgrading will reduce the frequency of that, as more areas catch and handle them.
Also, stack traces that users see don't contain debug information that reveals sensitive information.
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