Why is the Canada Line built the way it is?

http://www.vancitybuzz.com/2014/08/short-platforms-trains-skytrain-canada-line-built-nearing-capacity

It's such a sad joke that should be laughed at all over the world.

http://www.vancitybuzz.com/2015/08/four-stations-could-be-added-to-skytrain-canada-line

https://jfdatalinks.blogspot.com/search?q=SkyTrain-Canada+Line