I'm too lazy to watch the linked video, but yes — I generally agree with all your points — WhatsApp is a waste of time. I don't like that most people send a million short phrases on WhatsApp instead of sending a few messages containing two or three sentences. I don't like handing out my phone number like candy, though it's kind of expected when you go to parties. I also never join groups anymore because they're too cluttered. There's no system to organize threads (replying to messages doesn't count because you still need to scroll past information that isn't relevant to you).