Well we are kinda getting off track, no game requires online, you can technically play all of the main story and a good portion of the side quests, but there is content that you can use in SP that is locked behind online components, and if you are a completionist you are going to notice it missing. If you are fine with not having all your content then by no means don't let it stop you from playing these games. The conversation was about how online components affect SP experiences in general and these are the best cases of that.