Clearly for loads of reasons horses are not the solution nor anything near it. So less not decent info abject nonsense.
The alternative to petrol powered private transport is (a) BEVs (b) better urban planning to dissuade the use of cars and societal change that incentivises the “ right “ choice and penalises choices that are detrimental to society and the environment . We each don’t live on our personal “ island “ so collective living require compromises
All this is true. But, that approach taken to the limit would force almost everyone to live in high density structures, maybe as nice as the Arcosanti dreams, maybe not so nice. There are other solutions, but they have downsides and penalties of their own. Choosing between them requires making difficult to impossible moral decisions.
Just one example of a three way choice. Is it better to:
A: Have a huge number of people living with adequate and equal access to nutrition and health, but with limited opportunities to do anything but routine activities.
B. Have a similar number of people sorted by creativity and capability, with those high on the scale having wider opportunities and those lower on the scale much more restricted.
C. Have a much smaller number of people with access to wide opportunities with no prior assessment of their "worthiness".
There are sound arguments for and against each of these options. Different people will make different choices. These differences imply that there is no objective correct answer.