Think of all the abilities that comprise human nature. Those are what children play at.
Thanks so much for this, Peter.
Musing on the essential skills, I wonder whether we're witnessing the species generating a new one that doesn't fit into any of the categories above, perhaps fueled by AI. I've no idea what it may look like, but it feels as if there's something just round the corner that will make the industrial revolution pale into insignificance. So the new kids on the block may need not just another kind of skill, but a whole new category of skill to manage their future.
I think 'play' is also where we learn to bend/break rules too.