Why does "view" not allow wildcards?

[Eli Zaretskii]

> From: Ben Finney <ben+bazaar at benfinney.id.au>
> Date: Mon, 04 Jan 2010 10:29:40 +1100
> 
> If you don't want to rely on the current working tree, you might instead
> find it useful to process the output of ‘bzr inventory’::
> 
>     $ bzr view --name changelogs $(bzr inventory | grep 'ChangeLog')

Can someone please explain the subtle differences between "bzr ls" and
"bzr inventory"?

TIA