What Makes The Inca's Society Complex?

What makes the Inca’s society complex? We think what made their society so complex was their science, technology, art, architecture, language, religion, and writing. That they developed over the years they existed.

Science and Technology:
In science technology, they were more advanced, they built roads and had a communication and system using the quipus. They had roads that went throughout the whole Empire which was usually paved with stone, and for steep mountains, they made stone steps and for ravines or ditches they made rope bridges which they crafted by just twisting rope together. The bridges were made so well some of them still stand today. Same with the roads, there are some still here today. The roads were used for moving army troops,
For the buildings they made, they had similar designs throughout the empire. the only differences between homes and imperial temples were the temples were bigger and had better quality than the common homes that were found in the society. the most common material the Incas used in buildings was stone, they used it because they could shape them so they locked together to hold very well. The stone they used was usually only Yucay limestone, green Sacsahuaman diorite porphyry, and black andesite and they used harder stones and bronze tools to shape them the way they wanted. They pounded the stone to get it into the shape and once they were done they used a grinding stone and sand to smooth thing over. They used ropes and ramps to be put into place because sometimes the stones weighed over a
They were very advanced in science and technology, they built many roads for important people and chaski to travel on, rope bridges and stone steps to help with the travel. In language and writing they created their own language, but never really had a written language instead they use the quipus to send messages to high rankings. In architecture, they built beautiful buildings using stone and bronze tools. The art they made was based around their religion making sculptures of the sun god, and they took up weaving from other ancient civilizations and made beautiful clothes out of cotton, wool of alpacas, llamas, and the wools of the vicuñas and guanacos. Last they had religion, they were very religious people, and their religion was based completely around nature and everything natural, they had a great god named, Viracocha, and they believed that he created every living thing. For those reasons I think the Incas had a very complex society when they