Fair point, but as a counter, you could easily say that the factory engine oil is a lifetime fill as well.
You could just run the factory fill for the life of the engine, albeit, the engine would live a much longer life if you were to Change the oil.
All fluids are by definition lifetime fills if they are never changed.
I'll say, though, at 200,000 miles, you've definitely gotten your dollars worth out of the factory fill.