I truly think if you expose children to Bitcoin with proper education not just showing them the possibility of making money or growing assets, beyond all these if you expose them to Bitcoin and you prioritise the knowledge first, so long as those children have the self interest to invest in Bitcoin, I'm pretty sure they would do well. Aside just trying to grow assets, there are alot of things you can do and also have access to because of Bitcoin and if you truly understand it, you would know how to tap into the opportunities that exist inside. Long story short, expose your kids to Bitcoin but educate first.
You have a good point but, it not advisable to introduce bitcoin to a child at a young age, I think that will give them too much free, when a child is having his own money they become hard to raise, and you will find it very difficult to correct, guide, and advise. Too much of everything is bad including freedom, I'm not saying that parents should be strict towards their children, but they should be limit for everything. There is nothing wrong with introducing bitcoin to your children, but the best thing is to wait for the right time. You have to allow them to grow gradually and enjoy their childhood before placing any responsibility under their care.
When children are mature enough to understand, they should be taught about Bitcoin because if we want to teach them about Bitcoin, they will not be able to understand it easily. You are right that before giving any responsibility to children, they should be allowed to grow up gradually and you should let them enjoy their childhood.
As far as I know, learning about the complex technologies behind Bitcoin or crypto currency such as blockchain, cryptography or mining, decentralization is complicated, so how easy it will be depends on the age and mindset of a child. However it is easy to explain Bitcoin and its transactions to minors today because they are growing up with digital games, and the internet.