It's absolutely possible to do something that has the issues I'm describing and never see any bugs because you are disciplined and careful. However, as a contra

It's absolutely possible to do something that has the issues I'm describing and never see any bugs because you are disciplined and careful. However, as a contractor, I have worked with plenty of teams where due to horrible deadlines and sloppy practices all of the problems I've described have occurred. Basically: once you climb over the learning curve, Redux helps you here.