...If players know that ALL other players can only use one extra book going in, that gives them the sense they can never "fall behind" in their choice to enter the game. That it's not a game which involves buying a lot of books. That if they only ever buy one extra book they will be on equal footing (in their mind) with all other players.
Again, not true. If the book I use is great at the time, but later on a superbook is introduced, other players that have not yet used their +1 have access to those elements for their PC - and I do not for mine. It will not be equal footing if the books are not equal.
That doesn't have to be reality. I am not talking about whether the game has or should function that way when actually playing, I am talking about THE PERCEPTION IT CREATES IN THE MIND OF A POTENTIAL NEW PLAYER.
So no, no list of balancing different things and abusive versus non-abusive combinations and such. That doesn't achieve the same goal at all and in fact might feed the opposite goal.
It absolutely could meet the same goal, especially with an opening paragraph that states that the list was created for the very purpose of making sure that a new player would have a fun, competitive option that is ON EQUAL FOOTING with PCs that have access to other books while PRESRERVING AS MANY OPTIONS AS POSSIBLE (screaming is fun... wheee....) for all players.
That would just look like a highly complex set of many books involved, and a system where experts can weave their way through a variety of books to make a build that fits within those guidelines, none of which gives those potential new players the sense that they will not fall behind and need to play catch up to join this hobby.
To an unsophisticated player, it will do no such thing. They'll read the paragraph that states: We got you newbie - you can walk in and play with anyone and have a great time. You don't need to worry about being behind. We thought about this and took care of you. Then they'll see a list of stuff that shows that WotC gave thought to the situation.
Let me point out that Standard, in M:tG, is specifically designed to make players feel like they can walk in and compete without access to everything every published... AND IT HAS A BANNED LIST (wheeeee).
Optics, as you note, are important, but there are many ways to create the right optics.
I would rather they find the right optics for the right solution than settle for the solution with good optics even though they know it is not the right solution.