Unless said person has other obligations that they have to take care of which prefends them from watching new episodes or maybe cant watch episodes due to unforeseen circumstances and being a fan of a show doesnt mean that you have to be up to date 24/7, im a fan of many shows which im not up to date with simply because i have a lot of other things to do in house and like to watch things with my wife which works late shifts no to mention taking care of my daughter and then still find the time to watch all the shows.
As for spoilers of shows in this thread well it has been happening since this thread started and still is today and there have never been big issues with it so why not allow it? because a hand full of people dont like it? no ofcourse not.