Germany is not only composed of red boxes by the Deutsche Bahn. It also has a wide range of private operators. However, Train Sim World lacks of german private operators and more diversity not only for liveries but also possible smaller branch lines. I would like to have these better represented in Train Sim World. #germanyisnotonlydb
Yes, I know of these statements, too. I have a bit of different impression though. I think that Dovetail Games is not even actively interested to get in touch and communicate with private operators. At least I don't think that they knocked on every operators doors yet to see what the response from them is. It's faster and easier for them to make content for which they already hold licenses for.
Well, when it comes to Abellio in NRW, it's more than unlikely because they don't operate there anymore. Also maybe it helps suggesting a certain train for a certain route. Iirc, the BRB operates FLIRT 3 trains in Salzburg-Rosenheim nowadays. That would be a great DLC for a modern timetable.