[Confusion]

Here is a solution to a problem which I could probably have never ever thought of by myself

I'm not sure why you suppose you could never have thought of it, but I think it is much more likely that you would have thought of it, given a different background and history. Most likely, that history would involve an example of the same sort of problem being solved in the same sort of way.

Once you've seen solutions, they seem easy. So easy in fact, that it leads you to wonder why it took until, say, 1700 AD before someone came up with it. Much of present day knowledge has only existed for a few centuries and many 'obvious' things have been missed by millenia of great minds. The lesson from that is: we don't learn by being original or by having revelations: we learn by example and by abstraction from those examples. This is exactly such an example: you weren't supposed to have been able to think of it yourself. It's an example that shows you the way, that teaches you, that enables you to, maybe some day in the future, be original or have a revelation.