I thought normal users (who haven't rooted their phones) wouldn't have easy access to the root filesystem. I just looked on my phone (just by plugging it into m

I thought normal users (who haven't rooted their phones) wouldn't have easy access to the root filesystem. I just looked on my phone (just by plugging it into my computer and putting it in filesystem mode), and looked, and I don't see the folder he's talking about. Am I wrong? I'm not really sure about this.