I don't agree cause just go to the tower and ask/invite anyone then tell them in the invite u need help with the nightfall/weekly I have helped a few people before like that.
It's supposed to be a friend experience. It takes coordination. People who you've only known for 14 mins will not help you play effectively. Find friends. Message people. Make new friends. Join a clan. Make regulars. Or solo the -blam!-ing thing....