I’m typing this because n my phone, so apologies for any typos.
I think people are conflating two (or more) things in this thread: the Oxford proposals (which are merely a 6 month trial of a traffic filtering system on very few roads), the wider 15 minute city concept, and general car reduction initiatives.
Being careful not to out myself too much here: firstly, I’m not a town planner, although I have had some training. I have, however, worked on a number of planning initiatives and projects, at policy and grassroots levels, in England, Scotland and some overseas countries.
When residents in urban and suburban areas are asked to describe, or draw, their ideal living environment, there are common factors: walkability (ie they can walk to services and facilities that meet their daily needs); good local services and amenities for those daily needs; fewer cars; separation of cars and people not in cars; green space (and often, water - canal, river, lake, commonly, as most people don’t live near coasts); and good public transport for accessing services and amenities that they don’t need daily (hospitals, museums, theatres etc) or for those who cannot drive.
In fact, exactly the kind of area that is routinely described as an ideal place to retire to on Gransnet.
The 15 minute city (and 20 minute neighbourhoods in Scotland) concepts are just that: concepts which provide a possible development framework that meets community needs and wants. There are certainly challenges and questions to be asked about the concept, but they are answerable, and challenges resolvable, because there is no one model - it’s very much about a planning and design process that results in liveable areas which meet, as far as possible, local needs and contributes to reducing pollution.
Contrary to what the anti-brigade would have people believe, they are not about banning cars, but about providing viable alternatives, except where that is genuinely not possible.
And yes, they are about urban, not rural areas - the clue is in the name. There are other conversations to be had about rural transport and connectivity to local cities (hub and spoke, concentric ring model and more) but this probably isn’t the place.