Your comments appear to be critiquing the existence of the notation itself. I'm not sure what you expect the alternative to be. Words are used to communicate co

Your comments appear to be critiquing the existence of the notation itself. I'm not sure what you expect the alternative to be. Words are used to communicate concepts. Knowing the complexity of algorithms is important, correct? How would you go about teaching something like that to a student? Limit yourself to generic terms like linear vs exponential? Would that student have as nuanced an understanding of the subject compared to if he or she learned Big-O notation?