the inca technically speaking didn’t even fall by the definition. That massive civil war (huascarists vs atahualpists) had the pizarrists supporting the former and they ended up winning, pizarro and his men soon found manco inca to place the role of the inca since both atahualpa and huascar were dead by this point. It was only afterwards when the pizarrist-incan lands mess up relations with the crown of spain that the latter establishes itself there all as a result of the chaos that was caused both by diego de almagro and manco inca. And yes i called Pizarro and his troops pizarrists because the conquista was privatized and had no much to do with the crown itself, which is why it ended up in conflict with it eventually as well.
But thats to say, the royal inca descedants and the panaca were very much present even as the spanish turned the inca empire into the kingdom of peru, the viceroyalty of peru. They would also on paintings portray the 14 incas, and then put charles V as the one after since to the eyes of the populace the kings of spain were seen as the continuation of the inca. So it wasnt exactly a fall if not more than “mestizaje“, or a personal union of the system if there was any word to describe the events.
they had manage to capture atahualpa because he had come to cajamarca without much of his forces by his side as a fatal mistake. However, those forces did end up showing up and they had the pizarrists and all the native allies surrounded by a humongous margin. All Atahualpa had to do was give out the order and the entire place wouldve been massacred with no contest. But that’s not what he did, in fact instead his order was to send the troops to go kill Huascar. To atahualpa Huascar was the way bigger threat than pizarro ever could be. It makes sense when you realize that the huascarists at the end of the day were the main leading force of the so called “spanish conquest” alongside other ethnicities like the chachapoyas or the huancas, etc.
yet at the same time this holds very true, what mattered and what made the spanish conquest work was the ability to form alliances that both pizarro and cortez were able to bring to the table. Pizarro not only was sided with the huascarists, but Atahualpa as a last resort to his life and legacy gave Pizarro the hand of his sister, Quispe Sisa to marriage as a way of forming an alliance. This same marriage is what also luckily saved Pizarro since when Manco Inca rebelled and decided to destroy all-related to the spanish, it was the fact that there were locals that sided with Quispe Sisa as well as other natives that pizarro had allied with that allowed lima to not be culled from 4 directions in its infancy. Put any other army in charge of a conquest of the inca and they won’t succeed at all, it wasn’t about brute force after all it was about the charisma and alliances that lead both incan and aztec lands to become part of the spanish empire.
And because of this I’m not sure to what extent a technological advancement could change things. Because if the natives get new technologies, and if it was really the conflict of natives vs natives + some conquest company tagging along, it would mean that for the thread title to hold itself that only the losing native side gets the technology but not the other somehow?