Another big factor seems to be that the German Bundeskanzler has the sole power to decide policy and choose his ministers, so having parties form a solid majority to elect and support him is very important. In Switzerland, the government consists of the seven Bundesräte, who are peers and elected independently by the parliament. They rotate at being the Bundespräsident (formal head of government), who does not have special powers.

Since 1959 the four main parties has effectively voluntarily split the federal council between them based on parliamentary representation to rather than risk being left outside government for any length of time.

The distribution of seats follows a formula agreed by those parties, so it's not "news" that the council keeps pretty much the same party composition election after election.

Most other countries don't have any long standing arrangements like that, so the question of who will form the government is always a major subject in advance of elections.