I used to like speculating and discussing the timeline, but that was back in the day when we all sort of accepted that it was fanfictiony and silly but fun to talk about
But after Nintendo published an official timeline, it took it out of the world of fanfic, interpretation, and arranging things to your own aesthetic taste; and moved it into the world of wikis and the fact-and-logic nerd wars kind of fandom, and that made it less fun.
As someone who was also into Zelda timeline theory for many years, it isn’t at all my experience that “we all sort of accepted that it was fantictiony and silly”; on the contrary, most serious timeline theorists thought it was very logical and obvious for the most part, outside of a few problem games—namely the exact placements of OoS/OoA, FSA, and how exactly the first four games were supposed to connect after OoT’s originally intended story as ALttP’s Imprisoning War was changed during development and TWW and MM/TP were then created as OoT’s sequels instead (turns out they found a way for OoT to be ALttP’s prequel as originally intended by way of the Downfall Timeline, of course, so everything conveniently worked out in the end).
Anyway, yes, even though the vast majority of the timeline was clearly stated by the developers or the games themselves, there were still some things left unknown that kept people speculating. I think Nintendo also realized that once they officially disclosed the exact timeline, a lot of this talk died down, which probably isn’t what Nintendo wanted. So, what do they do? They start a
new timeline but don’t officially acknowledge it to keep people talking and speculating, just as we did before the Downfall Timeline was revealed. I think that’s exactly what they’re doing with the Hylia Timeline—except there’s actually
more in game evidence to suggest the existence of this one compared to the Downfall Timeline (which makes sense, because the Hylia Timeline was likely planned out in advance, while the Downfall Timeline would’ve had to have been created after the fact due to OoT’s originally intended story changing during development, so the only thing really hinting at its existence is the fact that ALttP’s backstory is contradicted by OoT as we experience it normally).
In hindsight, it actually makes a lot of sense, then, why Nintendo decided to officially reveal the timeline after SS released—
because they already had a new timeline set up in SS on which newer games will take place that they’re not planning to officially disclose anytime soon, just as had been the case before with the Downfall Timeline! Let’s be real, there’s no way Nintendo
wouldn’t have foreseen that officially releasing the timeline would kill a lot of speculation once the initial hype died down (which Nintendo wouldn’t want, as more people talking about the games is a
good thing for them), after all, and that would explain why they’re now being so coy about where exactly BotW/TotK take place relative to the existing timelines—because this was likely their plan all along and probably the entire reason why they were comfortable revealing the official timeline after SS and up to (but not including) BotW!