Isn't it also a way to keep outsiders out? If 30 mins by car becomes 1h30 by train+bus combinations, lots of people are effectively pushed out of even wanting to go to the city centre for meeting friends or having a family walk around.
If there are professionals willing to pay continually-higher portions of their salary to live in the city regardless of who they displace then why can't we find ways to build new areas they want to live in? In some places there is a huge weather or natural-feature draw that will always prop up demand, but in others there isn't. There's just a lack of imagination and effort.
Because people want to live their lives today, while what you propose takes decades and must be a process worked on by Town Halls, not "the people". And no, it's not the same. The Town Hall of rich people who didn't yet have the need to leave, is dominated by rich people who didn't yet have the need to leave, not the people who is more affected by the excessive centralization.
Cars are simply not viable past a certain density. It's silly (misleading at worst) to take a distance (say 40km) and a speed (say 80kph) and just claim the journey by car takes 30mins, ignoring everything else!
Trains + metro + bikes are the only way to make the journey you describe viable (and comfortable and fast).
My (European) experience is the opposite: it takes longer to go to work by car, you're sitting in traffic whereas subways and trains take a fraction of the time as they are not impacted at all.
I live in Rome, which isn't known for great public transport. Yet I've seen multiple times people going from Rome suburbs to Naples downtown (a completely different region, 150 miles away) than it took me by car to do 7 miles.
It's a rare case where American Exceptionalism is a fact.
The London subway system is just wonderful.
My city has "great" public transport. It's been appraised multiple times, which I guess means that average public transport must be worse than what I've grown up with. I take 20 mins by car from home (in an outer neighborhood) to my workplace (in a central area), 55 mins otherwise. When you consider roundtrips, it adds up (and if we add a middle stop coming out from work to somewhere else for some shopping, the time counting goes out the roof).
The 30 mins vs 1h30 comparison was assuming a trip from a nearby dormitory city 25 kms away, which is the minimum (insisting: minimum) distance everyone nowadays is being pushed out in order to being able to buy any home at a reasonable price. For example: where my parents live to my work is further away 30 Km: that's 30 min by car and 1h10 by p.t., but that outer city had reasonable prices 15 years ago, not today, so nowadays you would go live somewhere farther than that.
I find that typically people talk about public transport benefits from the perspective of being able to buy a home within the centre that is well connected. Yeah, the subway is great here if you live in a 10 Km radius, but talking about it is out of scope for most.
Trains don't have stop lights nor traffic. They don't care about rush hour. They are always going to be the fastest connection to a city center.
I live 4 minutes by foot from the Colonna Galleria train station, in a village 30 kilometers outside Rome, Italy. The train to Termini (Rome central station) takes 28 minutes, and Termini is the crossway of the 2 main metro lines and the most important city bus lines.
It's 33 minutes at night with empty streets and it's 1:15 at rush hour. Leaving work at 5:30 can easily cost you 2 hours in your car.
But sure, put me 3 miles from the train station, put my office in a place that is just 10/15 more inconvenient from metro/termini and it's drammatically different.
Woah yeah that changes the calculations, I had a similar situation before, andof course I preferred the subway by far. But you know, it depends. I work late into the evening and when getting out of the office, the streets are empty. So it's a hard sell for me to use a transport option that will cost me 1 hour of my already short free time before bed. But everyone's situation is different, that's why I am in favor of keeping all options open.
I live in Munich and yet going by car is often the fastest, and only during rush hour it's worse. I generally use my bike though, which is so-so. If was 5min by foot from the subway station (and not 15) it would change drastically.
Also I mean it's not terrible, but 30-45 minutes to get somewhere by public transport is the norm. 5min to the bus stop, bus to the subway, subway then is quick. And by car this is often faster, also more reliable, and no walking in the rain.