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Can paying down a mortgage be considered an “investment”?
Let's start from the premise that the mortgage is something you will have anyway because you need it to live (as opposed to say getting a bigger mortgage initially in the expectation of paying it down faster than scheduled). In that case I think paying down a mortgage certainly is an investment; one with a well-defined interest rate and maturity that depends on the precise terms of the mortgage. For example I have a (UK) mortgage that's fixed for the next two years at about 5%, and allows overpayments of £500 per month, which can be withdrawn at any time. So I treat those overpayments as equivalent to savings with quite a nice interest rate, especially since mortgage interest isn't tax deductible and so I actually get the full benefit of that interest rate.