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This is an impressive amount of customizable power!

As stated in the article, some IDEs can do some of that by default.

For example, CTRL+ALT+arrow down extends cursor so you get multi cursor in VSCode.

Selecting a word in VSCode and pressing CTRL+d starts selecting more of the same word. Then you can press left arrow to place cursors at the start of every selected word.

It's impressive how emacs exposes a neat API to do that and more!