Some of the weekly missions start to get a bit tedious after enough time. Last week I had a quest to complete 10 missions, a bit before that it was 5. But this week it is 25, which is a decent amount of time that some people don’t have access to. If the difficulty of a mission was what counted towards that counter, ie lv2 mission counts for 2 missions, while a lv5 would count for 5, it would provide a way for people to more easily complete these weekly missions when they just don’t have a lot of time due to work or other reasons. It would give a challenge to those who are skilled to complete it with level 5 missions in the shortest time possible, and provide extra incentive for those who haven’t gotten that skilled yet to play more and get better at the game by playing more higher-difficulty missions.