You still have the issue that r/canada is the default place to go if you're new and want to talk about Canada. To make matters worse, r/canadapolitics isn't advertised on r/canada, so how are new users supposed to find out about it?
Exactly this! You can create new subreddits as and when you like it, but country subs are the issue. You can't just simply create a new sub when the old subreddit is the default a person visits.