YYC also has areas like this, a little area on the north end of concourse A. There're only a handful of these gates so most of the regional props/jets still do go to the main terminal.... but it's not a YVR/YEG specific issue. You just see it more at YEG because there're less gates total, which means larger jets are prioritized leaving people in the smaller Dash 8s to go to the more "annoying" gates instead. An expansion of the YEG terminal would only temporarily fix this until traffic inevitably caught up to capacity and the props are back at the gates where passengers are walking outside.
Hypothetically all three airports should just invest in jetbridges for these gates, but realistically it just doesn't make sense to. Those regional flights usually have quick turnaround times and don't shuttle in massive amounts of people, so it's faster and more economical to have them walk 20 seconds to the terminal building.
We have it good in a way here in Canada, given it's commonplace at most major airports in Europe and some in Asia for passengers to deplane outdoors and get bussed to the terminal. We've been spoiled in the sense that YUL is the only major Canadian airport that frequently does this.