arrondissements

In fact, 9 of the 20 arrondissements have a higher population density than any of the other French cities[1].

It also doesn’t go so well in the Paris outer arrondissements or council estates in England-Scotland, etc.

Well, Paris is either very dense or not very depending on what arrondissements you're counting.

The capital's first four arrondissements are closed to car traffic on one Sunday a month.

Of course more aristocratic arrondissements are much more expensive and the Paris house market is completely mental, but that's another issue.

The average density of the 20 arrondissements is higher than the 5 boroughs.

Also failed housing projects in the outer sections of Paris (outer arrondissements).

I'm sure there's certain arrondissements that have good access, but it's not the whole city, and riding on the road is so dangerous I only ever see delivery drivers do it.

I don't have numbers, but I doubt that 12.3% of people living in Paris proper (the 20 arrondissements) live in detached houses.

While differences are less stark, arrondissements still have distinct styles.

I've also biked and seen others on the Maréchaux, through all arrondissements.

Some of Paris is nice, quiet, leafy arrondissements.

Translation: "What's the point of organizing an expensive vote on SUVs where everyone agrees." Seeing as some arrondissements were very much against that change, it's not hard to find anecdotas of places where the sentiment is against it.

I feel like Paris' 20 Arrondissements is too small, comparable to Zone 1 of London and "Yamanote area" in Tokyo, while New York 5 boroughs is a lot bigger and more comparable with 23 Wards.

Actually two of the 20 districts of inner Paris (the "arrondissements"), which you describe as a "historical preservation district writ large", are more densely populated than any districts in any Western city - except for Manhattan Community Board 8 and 2 districts in Spain [1].

Usually I have a kind of set goal, like “walk entirely across X place.” I think in Istanbul though I mostly just wandered for 100km (over the course of a week.) This past summer I walked about 124km around Paris over 5-6 days, going in a spiral through all the arrondissements.

This is unimaginable for other friends living in Paris (one of the 20 Arrondissements) and New York (one of the 5 boroughs), regardless of size.