A more discoverable UI may take a greater number of steps to perform. If the application is used rarely or briefly, that's a good trade-off. But if an application will be heavily used by a user who is incentivized to learn the tool, then their total productivity matters more since it amortizes over the lifetime of their use with the tool.

Text editors definitely fall into the "heavily used" bucket, so a good user experience might mean "you gotta read the manual, but once you do you can go 10x faster".

They're basic verbs you use to interact with text; not a full command. E.g instead of executing "format document" from a menu, you select the document with the left mouse button, and then middle click on the word "format". This executes the "format" command on the selected text. Somewhat like running gg=G in vim.