From a German perspective I don't think German media got more partisan. They rather became more clickbaity.
A notable difference is that it's simpler these days to read and compare different media, as well as looking at excerpts.
To the last point: Historically you got the complete paper and a good™ paper shares different oppinion pieces (even if main oppinion of a paper had one view, publishing opeds with opposing views is/was normal) however nowadays one doesn't look at the full package, but only clicks on single articles (probably spread in like minded FB/"social media" groups.
