This is certainly true. I’ve been loudly making this point for years. But let’s be honest: we‘re largely stuck with the existing pattern, of concentrated density in a few places, for a long time to come. There’s no Haussmann coming to bulldoze Leslieville. Given that, we need to maximize the few opportunities for intensification that are available.
And really: we’re not talking about very high density here. The West Donlands plan originally would have put about 8000 people on 23 hectares. That (400 people per hectare) is roughly 20% less dense than central Paris. So: one piece of inner-suburban Paris, with tons of green space, surrounded by an ocean of houses. That’s how we should use a big site in downtown Toronto?
When people compare this (much less the “Avenues” buildings) to 19c neighbourhoods in western Europe, it’s bogus. Lot coverage and road widths (and mobility patterns) are dramatically different. Most importantly, that kind of urban form goes on for miles and miles. You can’t build one half-baked fragment of it and claim victory.