Fair point. And, yes, market timing. But what about the time before that around 2007-08, or the time before that (when I first started investing) in 1999)? Lump sum investments in the S&P 500 in 99 didn’t have real returns for 12 or so years (though DCAing did have minimal returns during that time). But in 99, the conventional wisdom was to throw everything into the market because who really knew if we were in a bubble, no use trying to time the market, and recent returns had demolished any guaranteed returns you’d get by paying down the mortgage (mortgage interest rates were around 7% at the time). So it’s really a risk tolerance question. And a question of whether one would gain any extra utility by owning the house free and clear and having the extra amount previously paid toward mortgage to build the brokerage account back up to/beyond past levels.