I have a zipline in my back yard, when I first put it up it was roughly 80' long, my kids were 4 & 6 and I would manage them because (a) be a parent and (b) they were careless/clueless AF.

I extended the zipline to 200' this spring, it goes over about 50' of water. They're 6 & 8 now, they hook themselves up and do all the safety checks I showed them once. Literally once.

They also have full access to my workshop, they respect it and ask before cutting off their fingers.

I think we underestimate the young mind's respect for responsibility when we give it to them. Conversely, if you protect your child from everything, they do not develop the skills that ask inherent questions such as 'how can this thing I'm about to do grow wrong? What is my plan if it does go south?'