and what's inside a typical Ruger DA will far outlast what's inside a Python, given equal shooting mileage.
That's just not accurate. A Colt Python will last as long as any S&W or Ruger, if not longer. Most never need to be tuned; most never break. Every now and then after a lot of use, a Python will need to be tuned. Not a big deal - send it back to Colt, and it will do the work. Contrary to popular belief, Pythons are quite rugged and durable.