If you think Como, Incheon or Reading are anything like Beverly hills, Brookline or Piedmont, then I'm not sure you're getting my point.

All 3 of my examples are within 10 minutes walking/driving from the downtown core of the city. Yet, they have carved out a completely isolated township for themselves, so as to avoid taxation from the parent city, while benefiting from every aspects of being geographically inside the parent city. It stops a city from expanding organically, leading to oddly tiny cities (SF) or city boundaries that look like a kids scribbles (LA, Boston).

If you city isn't propagating radially from the downtown core then there better be a good explanation for it.

At least Richmond also has the issue of mooching off of the productivity of Vancouver, though the issue is less pronounced there due to decreased political power allocated to individual municipalities