You do have a point and I bet others also understand your point. But I still think that it's still applicable. Maybe not for everyone, but for others, especially newbies. Those three advices you've mentioned are usually being advice to beginners since they are still exploring and starting their Bitcoin journey so it's not a bad thing to follow these advices. But of course, through time and if you learned enough, your ways of investing and thinking may change. Your level of risk may change and you may start investing more on Bitcoin and not just using your extra money. And same goes for the other advices. These advices may not be applicable to you anymore since you've had enough experience and knowledge, but these things can still be useful for others.