OK, yes. The issue is only that I've never seen it used in an OK situation. Probably because I drive in the most suitable right lane, unless overtaking. I only ever see it being used while overtaking, which should be visible for the person speeding. And that is not a situation where it's fine to signal your intent for overtaking. When there's an Elefantenrennen that forces others into the left lane, you can signal all you want. There are simply too many cars to drive fast. I don't know how often I've been bullied out of the left lane, fearing for my safety, only to merge right back right behind the asshole who's now stuck behind the car that was right in front of me. I'll never understand that mindset.

Contrary to OP I hate driving on German highways because of the amount of aggressive assholes. I always found driving in the Netherlands much more relaxing.