Source Reference: https://www.youtube.com/watch?v=5EY6E4rg3gU
Comment Reference: https://www.youtube.com/watch?v=5EY6E4rg3gU&lc=UgzG-WBMIjKxSztGwP54AaABAg
2:01:41 "Complex" is a category for systems that we don't and maybe can't fully understand. If you could come up with a simple solution that works for all of them, then that would indeed be very persuasive, but there's no indication that we can possibly arrive there, we failed miserably in every single attempt up to this day. There's a reason why you keep playing chess and not tic tac toe. One is of higher complexity than the other, there's no "solution" for it to always win, it's not that both players can win, and from time to time you tend to loose because of not fully understanding what's going on, same with other systems of the real world, sometimes with horrible consequences. It's also not the case that the computer has solved it, it's just faster in calculating possible scenarios.
Comment Reference: https://www.youtube.com/watch?v=5EY6E4rg3gU&lc=UgyhK0fpAO0buBpdMoJ4AaABAg
17:30 What about UTC?
Comment Reference: https://www.youtube.com/watch?v=5EY6E4rg3gU&lc=UgzrG-lqewUyN4chqZ14AaABAg
2:01:48 Well, there are trivial and simple systems in contrast, so what the system is and how it behaves indeed might be an inherent property or characterization. True, any given system, once we start to understand a system, it's not in the category of complex systems any more, but complexity as a concept in itself might refer to systems that we will never be able to understand, and be it for limits of the brain, (event) horizon, resources on the planet, lack of sensory, lack of historical data from the past, etc. The P/NP (prime factorization and other instances) is maybe a prime example for it, as information gets lost in the process and facing the task to reconstruct it from the intermixed result, and while it theoretically should be possible to get back to the original state, we not only don't know how, we lack the idea of how to even approach one, or if there can be one at all. I have some intiutions about those, that they're constructed to be complex by definition, so yes, we can come up or find systems that will forever remain complex and hard because they're defined or constructed in a way where there can be a solution, but not an easy/trivial one.