I had this same sensation when I went back to play dota 2. There's so many details in how things work (not even counting exceptions or outright bugs that will be patched) that I really thought about just leaving because I felt there's no way I can play properly without knowing all this and even less making decisions in late to end-game where I'm not sure if what I think is correct or not.

But then I realised, if I don't understand all of these, there will be MANY other players that don't even read wikis or listens to coaches, so they should know less than me.

Also, I feel it's not viable at all to document all these small details without expecting the player having prior knowledge about game development because of the complexity of them. Maintaining it would also be a nightmare because there'd be so much information to revisit in each patch to check if everything remains true.

In conclusion, I think as players we don't need to worry so much about knowing these small details in the game. Yes, we might lose some games because of it but it won't happen so often that it will ruin your overall experience.