Not using the native Joomla Update mechanism could be a Major security issue as newer Joomla users are seen to be relying more and more on the active method to keep track of updates. Not having the latest version of extensions can be a major security issue as users might keep using old insecure versions without knowing that a new update has been released.
With Joomla 2.5 EOL happening months ago, this throws some really good insight into new user behavior and Joomla extension developers need to adapt quickly to risk of being left behind.
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