How often do we hear about the fallout of the 1906 San Francisco Earthquake? The one whose aftermath destroyed nearly half the city. That was 100 years ago. I've lived in San Francisco, there isn't a trace of it anywhere outside of a few plaques. Now extrapolate that to 200 years ago. Yes the Crisis threatened the entire Kingdom, yes it was terrible. What are you going to do? You're going to carry on. You are going to rebuild. Yes it's regrettable that 'historians' haven't taken a continent-wide view of the crisis and published it ingame, but from what I understand, scholarship in the Empire (especially magical, but also mundane) became highly insular post-crisis, never mind the Dominion closing it's borders. From the implications I got, the Empire barely even knew Crystal-Like-Law was destroyed until 'Rising Threat' was published. Well, the Penitus-Oculatus might've known, but the Imperial Public, the Scholars, the Historians didn't.
200 years may be two-thirds of a lifetime for an average Elf, but for a human, that's 6 generations. That's ancient history.
First off. Have you been to Winterhold? Pretty much exactly what you describe about San Francisco happened there. They talk about it and reference it multiple times. The event was roughly 100 years ago. They did not rebuild...
Secondly...
Talking about what happened to our recent generations is completely irrelevant to the time period in which TES is emulating in some respects. The Medieval/Renaissance times. We do not talk about many of these things (War of 1812, Vietnam, San Fransisco Earthquake) because we have so much to talk about in our day and age. So much has happened in the last 100 years and so much drastic change has occurred in our societies that nothing can even keep out attention for long. We want to discuss things like...the in-game lore, or lack there of, of a video game franchise that was started a little less than 20 years ago or so and has just had a new game released. Or any number of the plethora of topics we have at our disposal because of how easy it is to access information and education in this day and age. Back then, anything big was talked about for ages.
TES is a different world. If we are to superimpose some of our ideology from the time period it is reflecting. The average guy in TES does not know magic it would seem. So their lives are similar to those of people in the middle ages, albeit slightly better and there is more literacy. All that people talked about back then was what little history from the past that they heard the tidbits of. So yeah. These events are something they WOULD be talking about. Especially historians. Skyrim is not completely illiterate. They would have histories talking about all these events, Using the common time period with our technologies and way of living is a very big mistake when you compatre these things,
Nothing excuses the lack of books in these subjects either. TES is more advanced than medieval society because of magic. There is a much better quality of life for most people in game. They all seem to have books in their houses and writing utensils are everywhere. There are dedicated scholars studying Dwemer and Ancient Nordic ruins throughout the province. They would have historians taking the events of the 4th Era into account at the very least and making books about them. If there is a Dunmer writing about how he is in Skyrim and his people are going to take over and it is still circulating after what is likely a hundred years+ after he wrote it, then I see no reason there would not be books written on any of these things. Especially personal history like how the Oblivion Crisis affected Skyrim. Or Umbriel and what happened. What else is the Bard's College for? They of all factions in Skyrim should have some songs or books about what happened during the interlude between Oblivion and Skyrim.
If BGS wants to skip 200 years of TES history they should at least give us a more detailed account of what happened.