-7 is the reference for .47 std deviations but those who managed at home without respitory symptoms had much less than that (.02 std Dev). See fig two which has been replicated in basically every paper I've read on this.

If (big if) the severity of symptoms of covid is associated with immune response from it being a novel pathogen, then the long term outlook isn't so bad as long as everyone gets vaccinated. That's my hope at least. Otherwise we're stuck living forever with a disease that is extremely contagious and extremely feared.