Just don't change the ROOT account shell or pager. When you upgrade your system any major update will break the userland apps and for example if you change the root's shell to bash or something else and this shell doesn't work with the new kernel before you have a chance to upgrade the userland apps you will need to use /rescue tools. Same is valid for the PAGER and EDITOR as they are used to display and edit the merge information during major upgrade.
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