While I don't necessarily disagree with the sentiment, I can provide a real life take. Not specific to GDocs, this applies to all browser based editors.

You may usually write code in a terminal based programmer's editor (vim, emacs, ...) and realise the code you've just written is not quite right. You want to delete the last two words. There's even a default and handy keybinding for doing that.

So you press ^W twice.