About --staged ang --cached

Hi!

Even though the name "cache" is considered obsolete for a long time (for example, gitglossary calls it "obsolete" since 2005 [1]), there are some commands that still uses the flag --cached to operate on the index (e.g. git-rm, git-grep), while newer commands (e.g., git-restore, git-stash) use --staged. git-diff is special case where both flags exist and they are synonyms since [2].

Personally, I'm used to type `git diff --staged` instead of `--cached`, and my muscle memory often makes me type `git rm --staged` instead of `git rm --cached`.

Do you think that it would be relevant to add --staged to the other commands just like [2] did to git-diff? Perhaps this is just a personal issue, but I find it curious that those commands still have a flag named after an obsolete name while newer commands are using --staged.

Thanks!

[1] f1671ecbfa ([PATCH] Assorted changes to glossary, 2005-08-18) [2] 2baf1850ce (git-diff: Add --staged as a synonym for --cached., 2008-10-29)