Earlier quoted context omitted.
Isn’t that kind of nonsensical reasoning? The viruses evolved how they evolved. I don’t see how the decade they emerged in makes a difference? It didn’t cause a pandemic because of the properties of the virus. Not because of the “decade”
It is nonsensical but not because of the way the viruses evolved - if SARS1 or MERS had been capable of causing a genuine pandemic with their fatality rate then the response would have been different, so it wouldn't have been a mass extinction event! With SARS1 we actually managed to make a vaccine - we just didn't end up needing it.
That depends quite a bit on how rapidly it spreads. If COVID had started with Omicron's level of infectiousness, it'd have been a dramatically more deadly pandemic.