As a big fan of elder scrolls lore, my biggest issue with eso is making sense of the events in the game and how they make sense within the larger timeline of all the games.
Id love it if ZoS eventually came out with a book or a book collection similar to what blizzard did for world of warcraft. They released three books called chronicles that just locks down the canon stories of all expansions over the years.
We’ve gotten the tales of tamriel books already so i hope they will maybe just continue to release new volumes like that so that the biggest lore fans can get a definitive canon or at least a summary that fits this time period into the greater timeline.
The interregnum is known by the rest of history as a dark age where its thought that not many ppl were recording historical events in tamriel, but we see thats not really the case in eso so something would have to happen at the “end” of eso to cause history to be shrouded. Since eso is an mmo, its not just going to “end” (at least not for many many years to come) so the most common theory is that the events of eso take place within a dragonbreak. Maybe the next single player elder scrolls game will have clues as to why all these huge events in eso are lost to history in the other games.
Just sharing my thoughts and some speculations lol