Beyond that, a lockdown is not the only non-pharmaceutical intervention that's available to us. It's just that many governments have failed to use other tools at the right time and in a way that's actually effective, often only implementing them right before the peak of a wave when it's way too late.
Where I live, in Alberta, we had a really bad 4th wave in September/October. Prior to that we were at ~75% vaccination rate in those over 18. The wave almost killed our healthcare system and it was primarily unvaccinated individuals using the beds. Had we been at 100% vaccination rate, we most definitely wouldn't have been in the same position.