Never said it was ok, but this isn’t news. This season in particular, the story quests should be something people can play through, even if the activity is gone. PVE story, locations, and weapons are what bring people back to the game. To me the story should at least stay accessible.
And if file size is an issue it could be an optional download once a season is over. So new players aren’t forced to download it just to get into the game.