Yes, it is often the case. What happens is that when you have a list system, there's a natural tendency to select a broad range reflecting society in general, because you don't want to exclude any group, as that would be to your electoral disadvantage as a party. So there's an incentive. But the second reason is that if you're getting a quota system, it's much easier to implement that with a party list. Say you have 20 MPs and you make sure that, say, one in three is a woman, and that's the law that applies to every single party, then that quota system works well with a party list system. It's much more problematic to implement quotas if you only have one district. You can certainly do that through internal party rules, which means that the parties themselves prioritize certain districts. For example, the Labour Party in Britain said that out of the 80 top marginal seats, be half of them had to be for women and half for men. But that can create more internal conflict within the party than simply having a party list that reflects whatever those interests are: rural, urban, working class, middle class, young, old, minorities in terms of immigrants, or populations within the majority. All of those things naturally include a broader representation in the party list system.
On August 23rd, 2016. See this statement in context.