For parliaments, however, the system favors the two main parties, since a candidate needs those 50% support. This means parliament, which _should_ reflect the pluralism of society, will not actually reflect that pluralism.
In effect, this ranked ballot business is a way to appear to engage in voting reform without actually wanting to change anything about the outdated 2-party system.
In Canada, the liberals promised election reform. Until it turned out that ranked ballot was not going to be recommended by the electoral reform commission. Since that was the system the Liberals wanted in order to improve their chances in future elections, and they had little interest in actually representative voting systems, they scuttled the process and reneged on their promise that this would be the last election using the first past the post system.