That's the good news. The bad news is that aluminum has a lower melting point than the cast iron, so it is not as forgiving when it comes to heat. The transmission also operates under tremendous heat. The transmission oil is cooled by a transmission oil cooler located either in, or affixed to, the car's radiator. Overheat the transmission and ugly things start to happen.
Service means changing the transmission fluid and filter.
The overall effect is an increase in friction and heat, wearing out the transmission prematurely.