Again, they expect you to team with friends and created the missions for a larger community, which unfortunately isn't the case right now.
They expect you to team with your friends (even maxed level friends) to obtain those kills in the danger zones and war zones.
A squad of 3 level 20s and a level 60 sensei is how the missions were percieved to be acomplished in an ideal scenario. Again, doable if the community was larger but as of right now isn't the case.
I'm not arguing that what you're saying doesn't make sense, because you make great points if the missions were constructed for how the game is currently played by us the community. However, Rory and Hitspark designed these missions to be accomplished together and with a larger, more active community and that's they're reasoning behind why the missions are set up the way they are.