Not all extensions should be perceived as installable

On such pages as http://extensions.xwiki.org/xwiki/bin/view/Extension/HTML+Macro one has the impression that this extension is probably not in my wiki whereas it is bundled in most cases.

Adjustments should be made to the display:

• extensions which are part of a bundle should be displayed as such
• the "default current bundle" (XCS I think) should be the default display
• installation instructions should only be "opened" (or "displayed", "unfolded") if they are not installed by default.

Moreover, I feel that the word extension (part of the URL), and the word "Add extension" (part of the management menu) are hinting towards adding new stuff whereas both speak about modules which can be already there or missing, deleted or added.