The uninstall says:
Questions about uninstalling software in Ubuntu, or uninstalling Ubuntu from a computer.
And software-uninstall says:
for questions about uninstalling software on Ubuntu.
So, I think uninstall is a general tag and its excerpt needs to be improved.
Something like installation says:
DO NOT USE THIS TAG. Use either system-installation (for system installs) or software-installation (for installing software on a running system). Questions about installing Ubuntu, or installing programs from within Ubuntu.
Questions about uninstallation. This is very general tag. If you have a tag that's more specific e.g. (software-uninstall for uninstalling software) please use that one.
(something like updates says)