#2 because if the virus gets an update it might make sense to give the immune system an update, too (the same way we do with the flu, by the way).
#3 because it further reduces the risk to get even mildly sick at little to no cost. I'll continue to wear a mask on public transport even after this pandemic is over. I don't need to catch the flu or even the common cold either, if I can avoid it.
#4 because it enormously helps with keeping new infections at a minimum. Hence, further lockdowns neither required nor justifiable anymore.
#3 because it further reduces the risk to get even mildly sick at little to no cost. I'll continue to wear a mask on public transport even after this pandemic is over. I don't need to catch the flu or even the common cold either, if I can avoid it.
#4 because it enormously helps with keeping new infections at a minimum. Hence, further lockdowns neither required nor justifiable anymore.