Having millions of people regularly commuting into major cities is a disaster.
You create all this traffic, congestion on trains, sometimes people packed liked sardines for what? To sit in an office and work less than you would in the peace and quiet at home.
Much better if governments encouraged people to work from home, maybe have local hubs where people can go to if they can't work at home.
Cut down on the traffic and let people enjoy more of their lives.
When I don't WFH, I commute 4 hours a day, in and out of london - i'd rather spend that with my kids.