Re: [gentoo-dev] Cleaning tree of outdated packages

[William Hubbs]

I think another good reason for treecleaning a package is if upstream for
the package stops supporting their package and recommends that you use
a new package. In this situation, once the new package hits stable,
there is really not a reason to keep the old package around. Instead,
any necessary transition to the new package should be done and the old
package should be treecleaned.

William