Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How is not paying off mortgage better in normal circumstances?
One way of looking at it is that your equity in your house is an investment in a particular class of asset, and investing further in that asset class may drive you away from, rather than towards, your preferred asset mix. It's pretty common here in New Zealand for people's only investments to be their homes and rental properties. I wish those people luck when our current property boom ends.