I can see why you might ask this, but the book very much focused on the idea that a piece of land much preserve space for a parking space. It might sound innocuous but it is the source of many issues within cities, a contributor to housing inaffordability, why so many buildings in the US are surrounded by miles of parking, why some of the lots in your city are derelict, etc.
The book very much addresses why mandated parking minimums even in suburban residential lots are also bad (specially the mandated minimum less so the carpark itself), I highly recommend the book mentioned above.
Here's the preface of the book http://shoup.bol.ucla.edu/PrefaceHighCostFreeParking.pdf
There's also a good audiobook.
Now, instead of letting car owners pay for the public space they use (street parking), you are forcing anyone without a car to waste their own private space, in case somebody wants to park there.
The subtle difference is between American parking minimums imposed on property owners - “you must reserve space on your private property for this many cars whether you own them or not” vs Japanese parking requirements imposed on car owners - “you must reserve space on some private property for your car if you want to own it”
imagine having the only well-maintained sidewalk for a good ways out be blocked by cars whose owners have 2+ car garages!
In reality: moving away solved the problem.
Note: I grew up in an older (1940s) suburb with a town square that was actually walkable. This problem didn’t exist there. Mostly because the garage was detached and further back from houses, so you had your own proper driveway to park your car onto.
Guilty of garage as a storage shed, but its also crazy to me people don't store their second most expensive asset inside their garage.
The issue is really the perverse incentive: if there is free onstreet parking, its usually more useful to put your car on the street and use the garage for something else. For many people that might even hold true if they have to walk a bit to the next parling spot
That's really hard to escape unless you remove free on-street parking from large areas at once
My family tend to opt for smaller cars, because we're practical and don't have the faulty 'keeping up with the Joneses' gene, which means we can fit two cars in a two car garage.
We may still be in the majority, but it feels like it won't be for long.
UMR garage sizes should be inflating with the average car size. The Ford Ranger, essentially a fucking truck, and completely impractical, is the highest selling car in Australia because of backwards-thinking tax incentives from a few years ago, and then the ensuing Joneses effect.
Sigh... humans.
/rant
Apologies, I meant to add the acronym where first said under main roof.