As the saying goes: "Do not keep eggs in one basket." If you have enough money to split them into different portfolios, why not? It will even be more rational. One portfolio will support the other.
That's right, saving money to several different items is safer, than saving only one item, but if the money we have is only enough to buy bitcoin then it's better to get into bitcoin, because price movements are very promising, but if the money we have quite a lot, infestation in all choices is very good, because bitcoin and real estate both promise high profits in the future.