Thomas Shey
Legend
As I said before, simply establishing that any game can work for setting or genre play is a bit of a banal claim. It's mainly changing the shade of lipstick and dresses that your pet pig is wearing.
But its absolutely true. In the same sense that you can do almost any job with almost any tool depending on your standards of how well the job needs to be done and how much work you need to do to make it work.
I mean, let's be real, how good a job a given game system does at Task X is always going to be on a continuum. At one end someone is always going to see what's being done as hammering nails with a wrench, but at the other end you're always going to have people who find even the most dedicated tool for the job either insufficient or just, wrong. All only finding yourself on one end of that divide has said is that enough experience hasn't passed. This doesn't mean I think all positions on the line are as equally reasonable or generally useful, but I don't think seeing it as anything but a line does this sort of discussion any good.
I also think that this tends to involve communities invested in their pet games or systems. Some in the Fate community claim that Fate can do anything, but then you also have people like Rob Donoghue, one of the creators of Fate, saying "Umm...no it can't. Please stop saying this." Or you have people using the Cypher System who claim that it can do everything. I got chewed out for even asking fans what they thought the limitations of the Cypher System were. Nearly anything that wasn't "there are none" were unacceptable answers.
As I mentioned upthread, that's absolutely a thing. In regard to Fate I referred to it at one time as "so apparently its a desert topping and a floor wax." It gets very complicated with general purpose systems because there's a wider range of things people want to do that will be covered, and thus less likely they'll be able to see the cases where it doesn't seem like it to others as relevant. (This is, of course, not even getting into the people who will find that they don't think the system does what they want it to for anything, which complicate the issue because its how they're liable to see comments about it not being good for X thing.)