Answer the question asked, not the question you want to be asked. To deal with your point more generally, I would have waited the few months. This also isn't an advantage for the offline single-player. We've been waiting this long, we can go another bit if it means less Steam.
That answers the question.
The fact that you personally don't care about this particular benifit doesn't make it not a benefit.
The question should be phrased as "What benefits does steam have, if you ignore all the multiplayer stuff, all the auto patching, all the mod distribution and community features
and any benefits that I decide I could do without?" if you want to just arbitrarily say "well, I could live without that"
Answer the question asked, not what you want to be asked, again. He asked for the direct benefits for the single player. This is not one of them. With regards to this point more generally, better sales of Civ V do not directly translate into being good for the existing fanbase, especially if said sales result in future Civ's growing away from what the original fanbase was expecting. See Steam for an excellent example.
Again, perhaps maybe this isn't a guaranteed benefit, but it is a potential one. You're saying it doesn't count because it's not 100% set in stone as a benefit to you, but that wasn't in the question. Add "And is 100% set in stone and not just a potential benefit" if you want to exclude this from answering the question too.
Answer the question asked, not what you want to be asked, again. You need to listen to other people mate. There's no need to argue with this point more generally because it is an absurd argument that is basically a condescending attack on the people who are less than comfortable using a third-party software.
If you say "I don't like Steam because I'm not comfortable using third party software" then you don't know what the words you are using mean.
Simple as that.
The Civ series and every single other game in recent history has used a whole load of third party libraries, software and APIs.
If the root of your argument is "it has something third party in it! Eww!!" then you're using this argument because once upon a time, someone misunderstood what someone who knew what they were talking about was saying.
No relevance whatsoever to question.
Hang on a minute, you didn't answer the question at all did you? You sneaky bugger, you had me going there...
No, this is me attempting to give Toni some credit as to why she objects to Steam.
Evidently, you think she objects to it because she doesn't know what "third party software" means, has heard at some point that it's a bad thing an is regurgitating said issues in a context that makes no sense.
If this is correct then this does indeed have no relevance to the question. True.