Friction is the word I’ve been missing for all those tiny stressors that quietly pile up and drain you. The train example landed perfectly upgrading isn’t luxury, it’s buying peace when life’s already loud. “Luxury is being able to pick which stresses are worth it” hit me hard, especially as a physio seeing people with zero choice. Tangled earbuds, glitchy card readers, redirected flights alone are nothing, but together they’re exhausting. You’ve reframed wealth as headspace, not money, and it’s made me rethink what a good day actually costs.