One of the reasons it took so long for the Swiss women to get the right to vote was that it needed a constitutional change. Before that the right to vote was connected to doing duty in the military service. Now, of course it could have been able to say women have to do military service to. But then again we would have had again a system that would not have allowed voting to every Swiss citizen. And as constitutional changes have to be voted on by the people, as usual it took a while.