Diversified investments are only for the purpose of diversifying risks. This is not wrong. But your investment can't be too much, otherwise you can't operate coins at the same time when the market is turbulent. It is usually recommended that 1-3 investments are better. If you are rich, invest directly in Bitcoin and then travel. When you come back a few years later, you will become richer.
Yeah, I agree with you. We know that investing our money in crypto is risky and diversification is a step to decrease our risk here. You can get the profit from another investment if one of your investment is failed. And once again I agree with you, bitcoin is a good choice for a long-term investment.