while i definitely don’t work for S8, and this is in NO WAY an official answer, my thought (again, this is just my personal analysis based on playing this game for several years) is that, since the team is always trying to bring us new and exciting features, it would be quite unusual for them to suddenly go back to asking us for the very original set of expansion parts....
that’s why i personally feel comfortable selling them off to free up space in my barn. just my 2 cents...