I think that all this really depends upon the game. Some are indeed designed to be more complex, yet in a good way. And there is a bit of a difference between a printed manual, and a wiki. I find that wikis often have solutions you're supposed to hunt for, where as a printed manual may tell a "story" of the land, and just give more generic "how to play" hints.
In this context, I am very much mystified by "I played through game Y in 2.5 hours!". Uh, what?! I just paid for this game, and my goal isn't to run directly to some arbitrary finish line. I want to see things. Explore things. Learn the story that is presented around me.
And I'm not referring to side-quests, although those are fun too. I mean, I've been in some games where there is just "stuff" in the world around me, and you can explore and find random info.
I'm referencing games such as "The Last of Us" re: PS3/2013 version, where you could look at newspaper boxes and make out headlines, something that didn't make it with the same legibility into the PS4 remake. (Newspapers were still to be found in the PS4 remake, but a lot of places where there were papers in newsboxes had legible headlines in the PS3 version, and just blurred stuff in the PS4 version).
To run a max speed through a game with all sorts of side-info, is like watching a plot laden movie at 5x on mute. What a waste of money, and joy.
Another example is Horizon Zero Dawn, where there were all sorts of interesting recordings to be found, and just random info to be gleamed about "what happened", regardless of other main/sub plot info. Again, to fast forward "yay I did this in 2 hours!" is madness in the extreme to me.
My point in the above is, that any sort of wiki requirement for these games is a solid ruin. What a way to reduce fun, if everything about the game, and things such as "how this world came about" is just laid out in a wiki.
Yet at the same time, I don't want all puzzles to be so easily solvable. I don't want my hand held. Imagine playing God of War, with all puzzles solvable in 1 second. Why even bother?
I wonder, there is often talk of great 'apathy' today in youth. Games are a part of youth. An example is 'hide and go seek', which in the real world teaches one how to be sneaky, how to think as another trying to hunt you, how to be clever, and just how to play with others. This game is teaching you to hunt, and to escape when being hunted!
Video games of my youth taught me puzzles, were difficult, required fast reflexes, and by no means did I think better gear was the answer to issues I was having.
Now games are often one dimensional. People look for the solve online before even playing. People have issues and 1 minute later are looking for a work around. When I was a kid, maybe I could find help by phoning a friend, but talk about embarrassing!
Yet with puzzles comes satisfaction when there is a solve.
And with easy answers, comes an empty feeling.
So back to the wiki or not, I really think there should be no wikis, because the potential for lost joy is massive.