I choose to familiarize myself with the labels because I have realized that I can use them to analyse a sentence and determine whether it is grammatically correct or wrong regardless of its meaning!
There is this uneasy feeling in the back of my mind whenever I write a report: I feel very uncomfortable not being able to know for sure whether every sentence that I write is grammatically correct or wrong. By studying the parts of speech and a little bit of syntax, I am able to see forms and understand functions which gives me a sense of confidence.
I am not a native speaker, and I just feel hopeless to improve my English by asking about every single problem that I find because it is just too slow.
Studying the parts of speech and syntax enables me to truly begin to understand English grammar. Labels may have been just invented recently, but functions and forms, even though they evolve, exist.
Right now, my focus is to only improve my writing.