Having had the first bath window in 2012 and 3 more since, I feel the opposite. Close the door and it gets dark and you need to fumble with the o/h spot light. You can almost leave that window open 24/7 or cracked for fresh air which is always nice in a bathroom. With the Maxxfan on exhaust the air is pulled inside from the outside and then out the Maxxfan, always bringing in fresh air to that tiny room. The first doors were larger and blocked the air, bit since 2013 Escape made the door smaller to allow air movement, which you have none without a window. Your o/h vent in the bath is powered, but you are pulling air from inside the camper out which is not good for a/c nor heat. These reasons alone justify the window....
What you get by achieving your goals is not as important as what you become by achieving your goals....