Too few products come with exploration-oriented maps (as opposed to something like a grid map for use as a battle map) that can be shared directly with all players. For example, consider this beautiful map by Mr. Logos. The under/over dotted line style gives away information that explorers should not know. Added work is needed to create a version of the map that can be revealed directly to players. I do not mean to single out Dyson; this was just the map that prompted these thoughts this morning. Other traditional referee-only features such as secret door annotations have the same issue.
If the map itself is a work of art filled with nuance and detail, it seems like a shame for it to be seen only by the referee in a play context. While I probably notice this more now that I often share maps with fog of war reveal on hangout games, it could be relevant to in-person play as well, since you can cover up parts and use it as a visual aid. If it really is just for the referee’s eyes, the functionalist in me might even prefer something more schematic and less polished.
Honestly I am not sure exactly where I am going with this. Do I think that all modules ever should be done in the most convenient form for me personally? No. Do I think that all modules ever should put more effort into game aids? Well, it would be nice, but there are resource constraints so again probably not. However, it is worth considering the way maps function as game tools. There are still many opportunities for improving the usability and format of modular content.