I’m Scottish, and my answer to your question would be yes. Scottish people tend to be more progressive than English, and one of the primary driving forces behind the Scottish independence movement is because the UK Parliament is considerably more conservative than Scottish people would like, and therefore it holds back progress.
I don’t think that support of Scottish independence automatically makes one a nationalist.
Westminster is obviously deeply flawed and I can’t see any way for it to change, it’s a two party system entirely captured by the ruling class and basically functions as some sort of democracy theatre. That’s why I support Scottish independence, because I would like to live in a more equitable society.