Basically, my thought was that maybe we add a setting feature where a creator can add a number and every actor/actress whose been casted over that amount isn't allowed to be casted in that story (maybe add like a minimum limit of 400). It can reduce casting repetition and strongarms people into actually being creative with who they cast as opposed to choosing Millie Bobby Brown, Joe Keery, Charlie Heaton or Tom Holland for the 6752th time.
What about a 'casting limit' as a story setting?
I can see this easily being the bane of every Stranger Things, DC and MCU fans' existence (also fans of Anya, Pattinson and Stewart), it's very evil in retrospect. "You wanna cast Mr. Thomas Hollandus? Too bad." "Ima just YEET that Millie B.B casting into the bin, slam dunk!" "No Anya Taylor-Joy for you."
They'll be fine but it does give these people something to think about.