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It's not just about mathematical optimality. It's about the realization that everything fiat, including your debts, are illusory and constantly devaluing.
You're right though about consumer debt. That's why it's important to distinguish between taking on debt in order to finance temporary pleasure, versus taking on debt in order to buy real assets.
The number of people severely affected by overwhelming consumer debt far exceeds those who are actively making extra debt payments using strategies that are not the most mathematically optimal. People should generally be wary of debt, imo.