I submit that if "but I could be doing something productive instead" is a common thought when you are trying to have fun, that is the problem and not Factorio. It's perfectly ok to just have fun and not build something meaningful.
I can have fun without needing to build anything meaningful at all though, but when the barriers get to close, that's when I start having an issue, in my experience. That's why I play games that don't replicate work in a sense.
I don't think they're saying that per-se, I think they're saying: it's perfectly ok to both "have fun" AND "not build something meaningful" at the same time. I don't think you need to read in that having fun necessarily excludes doing something meaningful.
While we're on the topic of assuming intent: that invented word "problematic" - problematic to whom? Something being a problem is almost always a subjective stance, not a universal truth as that word implies.
