Browsing subs like /r/technology and /r/gadgets, it becomes apparent that even tech-savvy people can be luddites who are dismissive of new tech.
How was it like in the Middle Ages? Did warriors try to always have the most advanced weaponry and armour? Do we have accounts of people in t past dismissing arising tech? Has there ever been a desire to honor 'traditional ways'? Kinda like the Samurai in "The Last Samurai"?
I know of one specific case when Robert the Bruce tried and failed to adopt the war bow as a widespread weapon in Scotland. He issued a royal edict to this effect in fact. This was most likely as a result of his interactions with English armies and their widespread use of the bow to break up Scottish pike formations, and was most likely an attempt to counter this trend. It ended up not making much of a difference however, with pikes remaining the dominant Scottish weapon into the late medieval period.
Sources:
Michael Brown, Black Douglases: War and Lordship in Late Medieval Scotland, 1300-1455. Tuckwell Press. 1998
Michael Brown, The Wars of Scotland, 1214-1371, Edinburgh University Press. 2004