In summing up (ha!), phase is not just a potential problem in audio engineering. It’s actually one of the essential components of sound alteration. We’ve only touched on some of the most basic theory and techniques here. It will serve a budding engineer well to dive even deeper.
It’s amazing how you can play something perfectly 20 times in a row and then the moment someone switches on a mic, it all goes down the drain. One of the ways we dealt with this was by taking particularly challenging parts of songs and either breaking them into multiple tracks or separating them out and then re-splicing them together after. It takes all the pressure off getting one perfect take, start to finish.