Why is better to use external JavaScript or libraries ; and is it prefered to use jquery meaning more security?

Posted by shareef on Programmers See other posts from Programmers or by shareef
Published on 2012-07-01T08:37:34Z Indexed on 2012/07/01 15:23 UTC
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I read this article Unobtrusive JavaScript with jQuery and I noticed these points in the slide page 11

some companies strip JavaScript at the firewall
some run the NoScript Firefox extension to protect themselves from common XSS and CSRF attacks
many mobile devices ignore JavaScript entirely
screen readers do execute JavaScript but accessibility issues mean you may not want them to

I did not understand the fourth point. What does it mean?

I need your comment and responses on these points. Is not using JavaScript and switching to libraries like jQuery worth it?

UPDATE 1 :

whats the meaning of Unobtrusive JavaScript with jQuery ? and yes it does not say we should use libraries but we should have them on external files for that reason i asked my question.

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