Hello seeh
I understand we're seeing an image of a nearly defeated player, claimed to be a beginner. The player might have placed fields (you're calling them farms) more afar from the CC than usual. Probably the person doesn't even know the funtion of farmsteadts and might not understand the importance of short distances between field and "drop-off-site" (sorry, dunno whats the correct term).
We can speculate, if people think, different undergrounds lead to different results, but I guess we need to ask them directly. Based on a missing interrogation, it would be too much effort to change all the maps or write manual chapters on how it doesn't affect farming.
If I meet players online, acting like described, I will try to ask them to bring some light in this topic.
Best wishes
Obelix