Parable of playing time and experience
There is a widespread illusion that "as one ages, one's level automatically increases," but age is nothing more than "play time," and what is needed for raising the level of is "XP. If you leave it on until the morning, play time will increase on its own. There is not much information that can be read from age. It's easy to understand that you don't gain experience if you leave the slime alone, but it's more problematic when you keep on killing slimes and people think "I can kill slimes easily now, I'm strong" or "I'm doing well, I'm gaining experience, and I'm getting stronger". If your job is to defeat slime, that should be enough.
The only question is, how long do we have the "slime slaying job"? If I can get away with it, I'll be happy with that.
People can never let their guard down, but they can never waste their lives over-preparing for an "enemy" that will never come.
If the "job of slaying slime" looks like it will be there for 100 years, don't worry if all you can do is slay slime. It's just a question of whether you can see it through successfully.
I don't think anyone who has never been out of the slime forest can judge if there is likely to be 100 years of "slime slaying business."
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