A timing light still has its place for a quick sanity check on a basic distributor car, it takes two minutes and you don't have to drag out the scope for something simple. The scope is nice for odd problems but calling a slipped balancer some huge catch feels a little much, most of those cars are already running rough enough that you'd spot it anyway. Plus not every shop wants to drop the cash on a scope setup just to set base timing on a 90s truck that shows up twice a month. Sounds more like a nice upgrade than some big shift everyone needs to make.

Learned in a book once that the moment code gets copy pasted more than twice, that is your brain telling you a loop belongs there. My own first guessing game had six ugly blocks of the same if check until I moved it into a while loop and the whole thing shrank in half. It really is a great feeling when the answer was sitting right there the whole time.