You gotta look out for people who argue real estate transactions are as cheap and frictionless as stock market transactions, or insist on weird date ranges in historically bubble economies or rapidly changing demographic economies, or insist tax policy does not exist. Not everything is fundamentally an income stream and you need a plan when a simplification to that fails and you take a massive capital hit. If the error bars on the numbers are large enough, the same number can be interpreted to prove anything. Finally look out for people who confuse average/median with "everyone". All of those are HUGE effects when making financial decisions.
I'm not OP, but I have no mortgage and its worth pointing out that my personal break-even income is obviously twelve times the monthly payment lower than someone with a mortgage, and given a realistic 1/3 of income going to mortgage for most folks, obviously my runway is 1/3 longer than everyone with a mortgage. Also immensely lower stress.