Wow, what an incredibly dense thing to presuppose and advice others that the idea of data normalisation is antiquated because the primary purpose, when it was "

Wow, what an incredibly dense thing to presuppose and advice others that the idea of data normalisation is antiquated because the primary purpose, when it was "thought of", was to save disk space! Data normalisation is all about correctness - mathematical correctness. It's about reducing inconsistencies in your abstracted domain model so that you do not suffer side effects when using your data (such as in your programs). It is not optional. This is poor advice to others. Especially if "the adviced" are uninformed, new or finding the subject hard.