Agreed, there is ample opportunity with the medieval setting to find a more appropriate style. There is lots of vibrancy and beauty to be found in the cultures that AOE4 explores, so there is no shortage of material.
I wouldn’t want them to directly rip off AOE3 or AOE2 for that matter. AOE4 could truly have its own look that is pleasant, the current stylistic choice is just anti-AOE in general by rejecting culture, history and art in its direction.