Because the situation is constantly changing you can't postpone reasoning and decisions till solid data is available. If you did that you'd always be wrong because you'd reason and operate on solid data that is stale.
You need to take into account the preliminary data and adjust your reasoning and decisions as more data comes in.
> I could also make very similar arguments about the AZ vaccine, as a younger person.
How would that look?
> Declaring your statements to be "basic evolution" does not make them true.
Content of the statements does. Check them with your favorite evolutionary biologist or virologist.
> The article was talking about the British one.
So the data from last August seem to be imprecise because more recent data shows that British variant is certainly not less deadly than the original one.
https://edition.cnn.com/2021/03/10/health/coronavirus-varian...
> Using some similar fuzzy evidence, it would seem that "long Covid" sufferers are primarily people who caught Covid in March/April 2020.
That would be great if British variant at least didn't give people long covid. My country is in the peak of third wave, the first one caused overwhelmingly by British variant so it's a bit too soon to tell.