The City of Vancouver proper's density falls off from downtown, but there are still smaller multi-family buildings all over too. Towers are not the only way to get density. For example, this is Marpole in south Vancouver:
http://www.vancourier.com/community/vancouver-special/marpole/marpole-then-and-now-1.899071
And this is what surrounds those 'couple' towers in Burnaby for a considerable area (and slowly being destroyed in the name of creating profit towers for foreigners):
https://www.apartmentblocks.ca/apartment-blocks-listings/property/4330-maywood-street-burnaby-3/
And there are many, many other neighbourhoods like that that you won't see from up in the air. In any case, the reason why Vancouver's density peters out while other suburban municipalities have towers of their own is for two reasons. Partially, because they're separate municipalities, each one wants to try and create a 'downtown' for itself, so they zone some areas accordingly.
But also, because the Metro Vancouver municipalities all work in very close partnership with each other, there's something called the "Regional Growth Strategy," that aims to concentrate growth and density in several nodes throughout the region. So instead of density being concentrated at one downtown and slowly diminishing outwards as lio45 brought up, this happens in like 10 different places throughout the region. As Pinion said, it's to be more efficient with transportation infrastructure and also to provide people with more amenities closer to them. Instead of throwing one big density rock in the water that ripple out smaller and smaller, we throw in 10 pebbles.
Anyway, I'm not really sure what more you want from Vancouver. Our sprawl growth is extremely minimal, especially compared to Calgary. Most growth that is occurring is in the form of densification. If we had a higher growth rate, like Calgary, we probably would be building more multi-family housing, and a lot of it wouldn't be towers. Right now our housing starts are already very high, and largely in the form of multi-family. Just because it's not all adjacent to downtown doesn't matter. And it also doesn't mean that Vancouver's 'fallen off' in terms of planning; again, we're building lots, and most of it is dense. Why don't you show us some Calgary examples, because frankly trying to argue that it's ahead of Vancouver in this now is absurd.
This is Calgary:
https://cyclewriteblog.wordpress.com/201...isaster-do-transportation-habits-change/