...because if the mission is shorter your daily mission is finished faster. But these are not the missions we would like to see! Because players are going to vote this up this is going to end bad. I also would suggest to deactivate XP per Enemy in UGC missions...it also leads to bad mission design.
UGC mission could be changed that way, that you get randomly assigned to three mission from the top 50...
Oh come on! "Aid the Planet" even moves you forward on the interminable DXP grind on top of all that!
Aid the planet is a random mission; you dont get to decide when it comes up in the cards. Even if you try to just find it, its going to take you alot of time going in and out of the other missions that come up first.