Compatible update

hello,
I see more and more on the presentation of plugins,
http://wordpress.org/plugins/
forms that are not up to date,
we see that the plugin has had a recent update but compatible to line up we see an older version of WordPress, he should read the latest version, why not everything is up to date on the cards.
Before I was not paying attention to the date of the last update, I looked at the compatible version, now I see that I must be careful.

for example:
http://wordpress.org/plugins/wp-scroll-to-top/
Requires: 2.1 or higher
Compatible up to: 3.4.2
Last Updated: 2014-1-21
Downloads: 1,573

thank you

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