Formal basal testing is a bit of a pain to do but it is worthwhile. Changing basal rates, however, is not a set-it-and-forget-it one time exercise. Diabetes is a dynamic disease and until you learn to roll with the punches, you’ll struggle to keep up with the latest mayhem diabetes invokes.
What I’m trying to say is that you need to learn how to test your basal rates. Once you do that for a while, you’ll start to get a gut sense of what’s needed and then be able to make changes on the fly without having to go through the formal process.
I think of this like a jazz musician. An aspiring jazz musician studies the rules and diligently follows them. Once the rules become second nature, the creative musician can start to improvise and elevate the music to a higher level. You have to religiously stick to the rules before you can then deliberately and strategically break them.
For great diabetes management you need to be willing to do the tedious work while learning how your personal glucose metabolism works. Once you know the nitty-gritty of your situation, you can improvise to good effect.
Having said that, I know from long experience that diabetes is never a puzzle permanently solved. You have to observe, experiment, analyze, implement and iterate.