The fallen timeline branch is very silly; I donβt really see the harm in acknowledging that. There are an infinite number of ways they couldβve justified fitting the 2D games into the Child Timeline if they needed to fit it in somewhere. Even a third branch that isnβt the result of something so ridiculous sounding would be better if we really need an official timeline.
Youβre fooling yourself if you think they had the timeline totally figured out at any point before Skyward Sword outside of certain obvious connections. They didnβt even have the timeline figured out then because after Hyrule Historia they decided to reverse the order of the Oracle games and Link Awakening; theyβve already retconned it! Thereβs also the fact that before they made a conscious decision to limit the story content of the game, Four Swords Adventures featured dialogue that firmly placed it after A Link to the Past; and now the two arenβt even in the same timeline at all.
The best decision theyβve made with the timeline recently is to forego it entirely for Breath of the Wild. It takes place nowhere in the timeline but also after every branch. Thatβs perfect seeing as it combines so many elements that only exist in some of the branches; itβs great that they donβt feel like limiting themselves even after establishing a βsolidβ timeline with Skyward Sword.
It may be a bit silly but it works surprisingly well, and thatβs what matters. As others have said here, OoT was always meant to be a prequel to ALttP, but in the end the OoTβs story took a different direction that diverged from the backstory told in ALttP, which is what necessitated the Downfall Timeline in the first place. Sure, they could have done it another wayβ¦but Iβm not sure what that would have been when the explanation given with the Downfall Timeline already works out so well. Basically, for OoT to still act as a prequel to ALttP, Link
has to fail somehow, or another game has to take the place of OoT as ALttPβs prequel.
And as for the timeline having not been established from the beginning, thatβs simply not the case for the majority of Zelda games. Prior to the full official timeline being revealed in the Hyrule Historia, the following timeline threads were all pretty much already 100% confirmed around the release of each respective game:
/βTWW/PHβST
SSβTMCβFSβOoT
\MMβTP
OoTβ???βALttP/LAβTLoZ/TAoL
The only games that were really in question were OoS/OoA, which were likely not made with an exact timeline placement in mind in the first place given they were developed by a third party (and that might explain why Nintendo has already slightly changed their timeline placement once, because it was probably never set in stone to begin with), and FSA, which as you mentioned was very likely meant to be a prequel to ALttP (and was probably going to be the original plan of fixing the connection between OoT and ALttP) before its story was cut back and heavily altered.
I also donβt expect BotWβs current timeline βplacementβ to stand; I think TotK may make it clear which timeline it and BotW take place on and thatβll be reflected on the official timeline in time. I could be wrong there, but I think Nintendo may have just wanted to be vague about BotW to build up mystery and all, and it could also be that they just havenβt settled on exactly which timeline itβll take place in; after all, thereβs a massive 10,000+ year gap between it and the previous Zelda games, so an explanation could be made for
any timeline, really, and maybe they just didnβt want to box themselves into any particular one too soon, especially if they were always intending to make a sequel (which I wouldnβt be surprised if that was the case, since it just makes sense to get more use out of the massive world that they already created for BotW). And most of the callbacks to past games across different timelines in BotW (like minor location names and such) are just that; callbacks, and are easy to explain away as just being simple references.
I dunno, Iβm just someone who very much appreciates the timeline and loves that it exists. Knowing all these games are connected in the way they are makes the whole series a lot more interesting to me.