In a temporary sense, you could say that when one party gets mainly one kind of seat and the other party gets mainly another kind of seat, if they're big parties that could be somewhat problematic, but the problem tends over time to resolve itself. It's the very small parties, such as the Greens in Germany, for example, that rely on the list seats in order to maintain a proportional presence in Parliament. When it comes to big parties, it's a temporary situation.
I was writing in 2004. I think if I went back to Scotland today I wouldn't raise that as an issue.