If you have freedom of movement, someone will attempt to fulfill a need somewhere else because they won't get what they want in the proscribed manner in accordance with their individual desires.

So what? Let's say you have 75% of people getting what they want within their 15 minute city and 25% are leaving to fulfill needs elsewhere. That's still largely a success.

You're making the assumption that these would be 'highly ordered systems' reliant on authoritarian control. Yes, the ones they want to implement would be like that, but that's not required for the idea itself. I'm talking purely about infrastructure and layout. There doesn't need to be restriction on movement, there doesn't need to be resource allocation or price control. It's just a matter of arranging the districts so all needs can be met locally. It's about logistics, incentive, efficiency and convenience. At most, you're being authoritarian about zoning, traffic and infrastructure.

If it doesn't have a 100% success rate and people are choosing to go outside their districts, so what? The point isn't to get zero extra-district movement, it's to lower it. On the other hand, if the majority of residents decide they don't like it and they move away, then it's a failure that wasted resources, but at least it was voluntary.

If you have freedom of movement, someone will attempt to fulfill a need somewhere else because they won't get what they want in the proscribed manner in accordance with their individual desires.

So what? Let's say you have 75% of people getting what they want within their 15 minute city and 25% are leaving to fulfill needs elsewhere. That's still largely a success.

You're making the assumption that these would be 'highly ordered systems' reliant on authoritarian control. Yes, the ones they want to implement would be like that, but that's not required for the idea itself. I'm talking purely about infrastructure and layout. There doesn't need to be restriction on movement, there doesn't need to be resource allocation or price control. It's just a matter of arranging the districts so all needs can be met locally. It's about logistics, incentive, efficiency and convenience. At most, you're being authoritarian about zoning, traffic and infrastructure.

If it doesn't have a 100% success rate and people are choosing to go outside their districts, so what? If the majority of residents decide they don't like it and they move away, then it's a failure that wasted resources, but at least it was voluntary.