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You are very much correct that `Alt-.` with modifiers can do more than what has been described, it is however important to note that the behavior of `Alt-<key>` changes heavily both between zsh and bash, but also between `vi-mode` and `emacs-mode`.
For instance, zsh will switch to `vi-mode` depending on env variables such as `$EDITOR`, making `Alt-<key>` unavailable in that regard.
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It's also worth noting that `ctrl-alt-e` is _not_ a zsh default, though it is a fair point that it could have been added in the below linked section:
https://refp.se/articles/your-shell-and-the-lazy-exclamation...
For what it's worth, I had troubles finding a proper scope for the article contents — and with that the lines became a bit blurry in terms of what to include, and what not to include.
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I really appreciate constructive comments like yours, and hope it together with the article can help future shell ninjas!