you can find small specific issues with any game, including Warband. Fallout 4 is no exception. I guess you know that mods, patchs and workarounds (like autohotkey or changing language to ENG were available at one point or another).
it doesn't matter if the dev team is 10-man size (No Man's Sky was ~16), 100 (Fallout 4), 300 (Witcher 3), 1000+ (GTA).
I don't know why Fallout 4 didn't support AZERTY. Maybe they didn't think it was worth on release (expected sells on those regions). Maybe they had to cut it off for some reason. Its a weird issue, considering the engine is not new (its a progressive work they update with new games, so pretty much Skyrim engine).
Just pointing out the same thingy will happen with Bannerlord, not matter how good the game is