I think I understand. a "side mission team" gets a reward for completing the side mission. they feel they should get that reward to use exclusively because they unlocked it.
there are a few problems with this. you get "side mission teams" who exclusively attempt the side missions, and who get upset when other people join the side missions.
side missions are often more satisfying than the main missions and if you now get the rewards exclusively, why would you not just do side missions?
I've seen people use the blackfoot for side missions, (which is pure overkill), when there was very few people on the server and who could have used that assistance at the main ao. their stated position was that side mission team unlocked it, they get to use it.
how many times can one say side mission?