If you have stocks, forex, gold (or any commodity), crypto and savings account that means you are divested enough into things that if crypto goes down, you will still be fine, if it goes up then you will make less profit but that kinda means you can make profit from other stuff at the same time as well.
People diversify their portfolio because market is unpredictable and on that note it is not easy to determine which among the coins will perform well in price, there is nothing wrong in diversifying especially when you are not very sure or want to maximize profit as possible,
Mind you crypto has the high level of increasing profit in short time unlike forex, gold, stocks, real estate, but they are more secured than crypto, people can easily lose money in crypto unlike gold or real estate, however, investing 50% on crypto and 50% on other investment will be much better and more secure.