Wow I’ve never seen the full tech tree. It seems impressive and yes I believe things should stay medieval and I believe it was answered in a livestream (countdown to kickstarter) that the tech would not involve a changing of time. According to the answer given all tech driven advances would be based on new raw materials and villager level up leading me to believe there is no “tech advancement” per say. It seems that they’re more leaning towards civilization development as opposed to tech advancement.
I do have some quarrels with the tech tree though mostly just being nit picky things. Typically in fantasy a cleric is thought to be a battle priest, perhaps instead of the cleric call it a priest and at the priest tier have an archbishop? The brewmaster to physician is a bit concerning but I suppose it is set in a medieval time. Miller to bailiff also doesn’t make sense to me but I believe this is all still work in progress, and that some of these positions are merely placeholders.