I came accross one of these missionm for the first time yesterday (Flux in the hollows). I must say i enjoyed it. Sure i had to put it on hold until i found a brave partner in crime but that really isnt hard to do.
I guess it shouldn't be forced upon you but finding 1 other person to help really wasnt that hard to do.
I ejoyed the style of the mission and i hope they have more multi=people missions but like they said, maybe not in the story arcs.
Anyway the new content is alot more good then bad so keep up the good work Devs!