I'm not in any way denying it's possible to create a sitcom/SF hybrid that is inherently SF. Red Dwarf is an excellent example. All I'm saying is that this particular story is only SF in the most superficial of senses.
But I don't understand what makes Kallakak's Cousins quantitatively different. Most of Red Dwarf's plots could (and in some cases have) also, with modification, be told in a non-SFnal setting.
Yes, individual stories, certainly. But there were also stories that could not. If you gave me a single Red Dwarf episode out of context I may well think the same of it as I did of this story. Taking the series as a whole, though, it's clear that there's a difference.
I'm certainly not debating that the setting in which Kallakak's Cousins was told is a SF setting. I'm just saying that as far as I can see, the setting is mostly incidental to the story. Obviously, if the setting and characters were developed further that could change, but I wasn't talking on what
could be done, only on what
was.
Quite simply, my reaction to the story - as soon as I heard it - was that I imagined the author coming up with a non-SF story, figuring "this is not good enough", and adding some minor tweaks to make it SF. That's probably entirely different than how the story was written, but I'm not commenting on the author's intentions/writing process, I'm commenting on my reaction. You had a different reaction, that's fine. But you (and Croydon) reacted to my comment not as if I had a different opinion about it, but as if I was making some sort of grand comment about SF. I never said anything about what SF is allowed to do. All I ever said was that this story felt to me like the SF elements didn't play an important role in it.
Anyway, I am happy to disagree on the premise of whether this story is "SF enough" or not. What I reacted to in my response to Croydon, though, is that he seems to be taking it a step further and saying "even if you think the SF elements don't play an important role in this story, that's just a sign of how versatile SF is". That, in my opinion, is a wrong view, regardless of our opinions of this particular story.
To recap: to me, this story is no more SF than any other story that just tags
"but they're in space!" to the end of an otherwise non-SF script. If you disagree with that, fine. But don't try to tell me that adding some SF elements to a non-SF story is a sign of how robust the genre is or anything like that.