If you’re an educated, skilled professional who isn’t living a risky life, paying off a 3.5% mortgage is way too risk averse in my opinion. If you’re that worried, save 24 months of mortgage payments/expenses in a savings account, but if you’re not able to bounce back with even some income in 2 years (assuming you didn’t overbuy and aren’t paycheck to paycheck), then something has gone horribly wrong and you probably need to worry about more pressing matters than mortgage debt, like securing food.
Which is to say, what you're saying makes financial sense, but people aren't robots, and we have negative feelings associated with debts/financial liabilities. For example a lot of people worry about losing/changing jobs exactly because of these kind of financial burdens.
If being "mortgage free" gave people more confidence to take more risk (e.g. change jobs, take a work-break, start a business) it could ultimately still be more beneficial than the alternatives, even if the maths doesn't show that.
My point is % return is not everything. I would gladly give up a 1.5% return in exchange for the ability to up and move when I need to, or respond to emergencies such as legal/health/family/political and resource instability/etc.
Also, there is no reason to assume home values in general protect against inflation better than savings accounts or other "safe" investments".
But as I said above raw cash (or near-cash) is even more conservative than mortgage repayments.
> Also, there is no reason to assume home values in general protect against inflation better than savings accounts or other "safe" investments".
History gives us a good reason to believe that. Cash depreciates. Homes on average appreciate.
I agree that paying early improves your ability to move, though. You're less likely to be "underwater" (lose money) selling the house with more equity.
I wouldn't stick money in a low-interest mortgage if I was willing to tolerate some risk for a better return. Paying down a mortgage @ 3.5% is not a 'great' investment as you've pointed out, but the key is that it's risk free AND a better return than other no-risk investments (cash).
You may want a no-risk investment if you plan to use the money in the short-term after liquidation, say for another home purchase/deposit.
I-bonds are not necessarily long-term bonds, other than the 12 month non-liquidity window up front. No?
I really like those two bonds. I guess that's why they're limited to $10k/yr each :-)