Found this interesting - on this data waning seems to be far more of an issue against symptomatic infection but protection against severe disease far more robust.Big question has to be whether that continues without injections to bring antibodies back up every 3 months - if they wane as claimed then surely that's the future, possibly indefinitely?
“Odds of severe outcomes did not differ significantly by sex, race/ethnicity, time since primary vaccination, or whether infection occurred during the period of Delta variant predominance.”