Unlike prior Battlefield titles which had remastered maps from earlier time periods (BF4 used BF3 maps, BF3 used BF2), BF1 takes place before all the others, so it wouldn’t make much sense to reuse maps from titles that take place in the future. Many cities didn’t even look the same and some areas are designed with more modern architecture, so it would look out of place. Lets focus on new maps.