If I was being sceptical I'd say ...
The reason the UK didn't sign up for the European procurement of PPE was that we'd end up being forced into funding the European Covid bailout. I've no idea what happened to all the small and large companies offering or actually building ventilators, but this seems to have faded away from front page news.
At some top level above Sage, there has been a decision that eradicating the virus is impossible, so instead we get on with managing it. Keeping people cooped up forever isn't feasible and . So this top level decision has also been that out of the two, people meeting outside is better than meeting inside and so let people meet outside.
But there's also a Brexit undertone to it. That the government is discouraging workers from other countries staying here, and that the Covid is making people think they are better off going "back home".
Also a "social cleansing" undertone as alluded to by RB and that if people die, well they probably weren't contributing much to the economy anyway. (elderly, underlying health issues etc).