As case numbers increase to record levels, we also need to consider other forms of brake that exist within the current system, beyond the handbrake that is lockdown.
For example, assuming plenty of people still get tested and still follow self-isolation rules, as the number of cases in communities increase, we end with a sort of 'partial lockdown by stealth' as various businesses and services including schools and hospitals lose many staff members to self-isolation, and are no longer able to provide a normal service. In future the authorities will look to remove much of this stuff from the picture too, by changing the rules, but those rules havent been removed in time to avoid large disruption in this particular wave.