This has actually changed over the last 10 years: today all but the cheapest on/over ear headphones will come with replaceable cables (2.5mm jack in headphone end).
Background: I have a collection of even older "goodish" headphones which I have kept alive with solder over the years. My teenage son recently started buying similar headphones, and they all have replaceable cables. This was me as well until my Yes, this wasIf you have bought a rea