Just in case
you are wondering why we make such a fuss about it.
German governments are/were often coalitions between a big party and a small one. Sometimes the small party does not make the 5% cut, so the big party does not have their expected partner.
So if voters who want big party C to rule see that little party F is scraping around the 5% mark, they may decide to vote F instead of C to supply C with a partner.
There is also the fact that majorities may depend on a small party making the cut and taking seats from the other parties. In the past, such things often made or broke governments. Currently the political landscape is changing fast so the old 2-party coalitions are getting rarer. In the eighties/nineties it used to be either christian democrats + liberals or social democrats + greens, now we get things like grand coalition (social + christian democrats), traffic lights (social democrats, liberals, greens) or Jamaika (christian democrats, liberals, greens)