The opportunity we've missed over the last few years is that of educating the public about small-scale measures we can take to reduce airborne disease spread. Even small things like opening front and back windows for air flow.
Politicians the world over wanted to "take the win" and declare covid over and life back to normal. They could have been honest and said it would be better if workplaces and schools were well ventilated, because covid is a nasty disease with even then increasing research showing health consequences even when mild.
They could also have been honest that economically the government couldn't afford to provide that ventilation, so it would be up to us to do whatever we could voluntarily.
If they had been more honest like that, useful knowledge about how to reduce the risk of airborne disease would then be much more widespread, and that would make us more able to deal with the next such pandemic. It would also mean less covid even now.
Instead, they told us it was over and not to worry our pretty little heads over the details, and as a result we now have less useful community knowledge than we could have, so we'll once again all be waiting like sheep for one size fits all instructions.