If you dont upgrade you cant play specific pvp matches only 3 condensed types 6v6 3v3 FFA. 1 strike playlist. You cant earn legendary marks or buy anything. No nightfall, daily heroic story, daily crucible, weekly crucible, heroic strike playlist. You cannot level to compete in IB or ToO. Like I said %90 of the game that you paid for/play (endgame) is locked. All other content is rendered obsolete.