Yeah I think this system can be helpful if you’re serious about identifying solely from recordings. Let’s say I want to identify bird singing in an area, I’d want to make a list of species that do trills, and separate ones that do simple trills, slow trills, 2-parted trills, etc. Then when you come across a trill song you can search up recordings of each species and compare them.
Eventually you get an idea of what warblers tend to sound like, what finch calls tend to sound like, etc. so you can narrow down what you’re searching for. But it’s definitely more challenging than in the field where you have habitat and height and other clues for context, plus a chance of seeing the bird.
Having a spectrogram can be really helpful since you can often see differences that aren’t apparent by ear.