This. Absolutely this.
I used to hate tabs and want 2 spaces only, until I started working with other developers. Then suddenly tabs made sense, especially when you've got IDEs coercing every edited file to a person's indentation standard. Standardize on the tab and the pain goes away.
It means 1 indent, not 8 spaces, 3 bananas or one tree. It is a unit. How the user displays that is up to them.