Actually, it does not take a huge amount of data to make use of statistical process control. In fact, it's so little that someone should be able to do it with p

Actually, it does not take a huge amount of data to make use of statistical process control. In fact, it's so little that someone should be able to do it with paper, pencil, and calculator. The statistical technique I think that's better able to displace A/B testing is design of experiments (DOE). This approach also does not require that much data to implement. There was an excellent youtube series on it where the presenter used popping popcorn for his experiments. I can't seem to find it now.