I see the "top/optimal/power player" argument repeated consistently, yet it is a strawman. I did not see anyone in this discussion imply or say that he/she is a super player nor anything similar, that is being distorted by some people for the sake of destroying arguments. I will repeat again: I don't consider myself a "top/optimal/power player" in any sense. I started my argument, and repeated it clearly, by saying that I start my games in a very suboptimal way, making mistakes and inefficient builds, etc. I did not yet use the Magnus chop, for example. I rarely act as a warmonger, and consider myself a builder. I do not save scum, even if some people do not want to believe that (their problem).
Even with all that "self-challenged", suboptimal play, I can end up winning all games in Deity by using some game systems that, by definition, the game itself should also be using (a.k.a. the AI). Best example I got (but far from the only one): the spies. When I start the game, I KNOW that my correct use of spies will get me out of any disadvantage created by myself with my suboptimal, relaxed early/mid play. Again, I repeat, I have destroyed the entire world's supply of Spaceports, EVERYSINGLETIME without any opposition, and won those games with ONE Spaceport. I have stripped Cultural civs from ALL their arts and artifacts, stopping their huge lead in CV, and winning once again, without ANY opposition. I have bombed the heck out of civs destroying their infrastructure and stopping their huge lead, without any opposition. And on and on, example after example...
What that shows me is NOT that I am a superDeityTopOfTheWorld player yeyme!, but that the AI DOES NOT PLAY WITH THE MAIN SYSTEMS of the game. That is a HUGE fail. Period. How some people see that as offensive to their ego/personality, I don't know, but I guess that speaks more about each different personality than about my statements.
I guess, in the end, this whole argument has to do a lot with different personalities. Some personalities are competitive by nature, and others are not. That is fine, and normal; it's part of our diversity. A competitive personality needs to feel challenged to enjoy almost anything, including work and games. Victory for them, in any sense, is empty if it does not come hard. Other personalities are more relaxed in nature, the journey is more important than the destination. Both should be able to enjoy their passion (and we are ALL here because the civ series IS our passion) in their terms, and to achieve that, the AI is very important. An AI that does not know how to use its own main systems "MAY" still satisfy the more relaxed personalities, but will never be enough for the competitive people out there.
What is definitively not right is for one type of personality to tell the other that they are wrong, and that they should adapt or create their own environment, or go, and that is exactly what I feel one camp (or some people in that camp) is telling the others.
Nevertheless, regardless of the personality analysis, I think we can at least agree on the fact that, by definition, the AI should be at the minimum be able to use ALL its systems when playing the game. If it can't, it is a fail by that definition, and needs work.