I think you're right on the money man; arguments like this seem to want to apply a very abstract and general analysis to an outrageously variable and human-scale problem. It's not like the stock market where everyone is getting exposed to the same factors to some extent
I'm also suspicious of all the "unavoidable" maintenance costs which usually seem to be what eats up the upside of owning in these arguments. They're probably doing the right thing by being conservative as far as expectations, legality etc., but I don't actually know ANYONE who's replacing their roof half as often as these goons say you will have to. Growing up around hicks I can tell you that they're financially retarded in countless ways, but when it comes to fixing something that's broken often as not they'll just... do it. And I've been on the opposite side of picture enough times to know that half the time you hire a contracter, you're crossing your fingers and hoping the guy you're paying 90/hr is well-meaning and doesn't have a couple zoomer helpers who will spend half the time vaping under your staircase (ok maybe I'm extemporizing very slightly.)
I also can't help noticing that these personal finance rule-of-thumb narratives are very financially liberal from the one direction (saving 10% of your income is great, good job!) and very conservative from the other (you might have to pay HOA fees, army ant insurance, and floorboard tax! Better stick with renting!)