Well, the article says: "There is no way to distinguish between the Tab key and Control+i. It’s not just ‘the same’ as Tab, Control+i is Tab." So you'd be mapping Tab to Escape to get out of insert mode.

If you :set autoindent you'll never need to indent using the tab key. Indentation happens automatically as you write code.

In the very rare cases where you need to change the indentation of a line, there's == or, if that doesn't work, you can indent a line forth and back with >> and << .