Huh?In my simple mind most of the time bonds are at best for "capital preservation" to not lose money to inflation but you're also not making money. However, you can also lose money with bonds like anything else. Occasionally, rarely, there is a window where decent money can be made with bonds. I can see the advantage of increasing bond holdings as you get older for capital preservation but that's about it.
See my previous post. Most people buy such things for income. If you don't need the income, then avoid bonds or income funds.