|You may understand the show, and I'm sure you do, but I think that you are definitely missing something. I mean, by the simple act of choosing not to follow up on outside sources of Lost canon, you are "missing anything". For example, a pretty crucial part of Lost canon came out at the end of the Lost experience, a video explaining the origin of the numbers, what they mean, and their relevance to the island. None of that has been mentioned on the show, except in minor background details (see the Blast Door Map in season 2, which gives a smorgasborg of information you can't absorb in the 2 seconds you see it).|
Ironically, I now remember I did read a summary of The Lost Experience (rather than playing it) so I remember I did acquaint myself with this information. However, I don't think it added anything, really, to my understanding of the show. I don't think it matters what the Numbers were "for". I think a lot of this is McGuffin that was inserted as intriguing clues, then retroactively given a meaning ~ I don't believe a lot of this information is integral to the plot, rather than bonus links.
The equation relating to the numbers has not, as far as I remember (I know I've just shown my memory to be faulty) had any further significance or role in the show since the Lost Experience. Sure, it's in canon, but you don't need to know it.
Does this work as a parallel? The backstory of bounty hunter Aurra Sing and Twi'lek Jedi Aayla Secura are in Star Wars canon. Sure, knowing their adventures in the Expanded Universe, approved by Lucas, might give you a feeling of deeper understanding, and a degree of satisfaction ~ it might make you feel you have gained an important context that adds to your engagement with the Star Wars Prequel Trilogy. But to my mind, those are entirely bonus features that aren't really integral to the core text of Star Wars.
Maybe the important thing for me here is producer intention. I think the core text of Lost (the TV show) like the core text of Star Wars (the movies) is intended to work just fine without those add-ons. If the central text was not fully comprehensible without those add-ons, I'd agree that Expanded Universe paperbacks and ARGs are part of the central text (rather than peripherals). But I don't know if I can think of an example where this is the case. You don't need to play Enter The Matrix to fully understand and grasp the story of the Matrix films. You don't need to visit the websites for Nathan Petrelli's Presidential campaign or Mr Saxon's prime ministerial campaign to understand and enjoy the stories of Heroes and Doctor Who.
I don't think we are at the stage where those aspects of the popular text are genuinely part of the core, rather than satellites.
Taking your view, where would it end? Have I understood and fully appreciated Lord of the Rings unless I've read The Silmarillion? Have I fully grasped Alice in Wonderland unless I've read a biography of Carroll? Then why is one biography enough? Don't I also have to read his maths treatises and study his photography? Where does the mosaic end, and by your principle, what kind of text is NOT an ergodic mosaic?