[ANOTHER FLAME WAR] Are dragons overpowered or not?

Yes, powerful muscles are needed for flight. But perhaps dragons had a special muscle structure, different from the muscle structure of other animals?

Also, flight requires low weight and lightweight bones... But dragons everywhere weigh almost as much as Diplodocus, and they are even more unruly...
Pterodactyls weighed no more than 100 kg... and even a strong wind could break their wings...