The introduction of Bach to music had quite an impact. Before Bach, many were ill - tempered and most became well - tempered after Bach. Harmonically speaking, Back's composition were way ahead of time. He introduced unexpected chord changes. He also initiated the keyboard technique that is still used up to date.
B they tend to promote because training and getting people ready takes a lot and they want to keep them there as long as possible instead of paying to retrain people all the time
