I've seen exactly that fearlessness with my six-year old twins when they get a hold of my phone or iPad. They've found features I didn't even know existed. They also are really adaptable. My wife, who is used to using either her iPad or her surface for computing has, despite a much longer span of using mouse/trackpad driven selection, developed a hard to break habit of tapping the screen on my MacBook. My kids, when we switched them to the MacBook for their virtual class meetings, adapted to using the trackpad without a moment's hesitation. They were also infinitely better than any of my co-workers have been about muting/unmuting themselves appropriately during videoconferences, as have their classmates. They're just learning to read still but once they've unlocked that achievement, I can only imagine what they'll be capable of doing.