As a new parent and someone who has been through similar "obsessions" as a child, perhaps I can try to explain the sentiment, even if I don't necessarily agree

As a new parent and someone who has been through similar "obsessions" as a child, perhaps I can try to explain the sentiment, even if I don't necessarily agree with it. I imagine it comes from a line of thinking where the parent worries if their kids becomes too focused on one particular thing and spends too much time either doing it, talking about it, or thinking about. The parents may worry that their child's interests are not well-rounded enough. Perhaps "Minecraft time" is taking away from outdoor time, or music time, or sports time, etc. A total ban seems harsh, but perhaps the child's interest is bordering on addiction and this an attempt to solve that problem (again, I'm not endorsing this, just trying to reason through it). I know my parents were very unhappy with the amount of time that I would spend playing video games. They often called it an "addiction" and from an adult's point of view they may have been right. Personally, I don't think there's anything necessarily wrong with a child or adolescent immersing themselves in something for a period of time, as long as it's temporary. As an adult now, I certainly don't spend much time playing video games anymore and I see many facets of my life where that time investment as a child has paid off, but I can see where my parents' worries (even if misplaced) were coming from.