Kid’s brains are basically information sponges, and when we talk about “being good with technology”, all we usually mean is “Able to navigate a Apple UI designed with your grandma in mind.” or, if we’re being generous “Able to open the settings menu and tweak stuff”.
It’s not surprising your kid can handle a Chromebook just fine. You may not have realized this, but the physical size of the controls is pretty much the only reason you don’t have to keep an eye on your car keys.