Be careful with talking about changing technology!
In CKII, they had a method that technology spread over time over land, which at least kept somewhat historical technologies and spread (nomads did not know much about building complex architecture or ships, peoples of modern russia not knowing how to build stone buildings before around the period of christianization)
but then Johan and the gang find a way to "improve it", to make it more fun!
Now the entire world basically has similar technology very quickly, nomads know how to build magnificent cathedrals and the like
So, be happy with what you have, and hope they do not try to "innovate" too much...