It indeed looks simple, but imho one has to have at least 500k, but most probably more than 1M USD worth of wealth in order to get even close of thinking to diversify like this.
But maybe I am wrong and then I am open to suggestions/ideas.
That was my first thought too, it is difficult to diversify especially if you don't have enough money or you don't have because as far as I know, it is pretty expensive creating a portfolio that will match that, not to mention that most of them you have to pay a large amount of management fee. I think that it is the end goal but in my opinion, you have to start focusing on one of them first so you can concentrate the wealth and make more money and then diversify.