Don't think Bayern operate a local talent preference more than any other club would, from what I recall the clubs in the Bundesligue's were required to build yooooffff Academies and they also have to have at least 10 or so players who are eligible to play for Germany. So, I guess, now you have their top tier having a massive talent pool to draw from for the national team. The rule probably still applies today?
Don't think Bayern operate a local talent preference more than any other club would, from what I recall the clubs in the Bundesligue's were required to build yooooffff Academies and they also have to have at least 10 or so players who are eligible to play for Germany, I take it the rule still applies today.