You are welcome to submit possible changes.I did work construction for some years, we never used the word "vertical", it was always "plumb" and "level". We used 2/4/8ft levels to determine both "level" and "plumb", and then with bubble levels could get a sense of pitch depending on what lines were on the bubble. I never saw a digital inclinometer level in that trade, probably too expensive at the time.
I was just noting the NEC seems to throw in extra words when it's technically not needed.
sometimes when they make a change wording gets a little workover the next code cycle as it is discovered it could have been worded better. The section in question here AFAIK has been the way it is for fairly long time though.