Perhaps it is not right to disparage all alt-coins. Some alt-coins make you a lot of profit. As Bitcoin is the best cryptocurrency, comparing alt-coins with Bitcoin is not fair. Decentralization system is it's main basis.If you want to get more profit from bitcoin, you have to invest and hold for long term.
Although it is not appropriate to compare Bitcoin with all altcoins, this has also started to happen since many altcoins started to appear on the market and became known to many people in the crypto industry at this time. I also think what you say is not wrong because investing and holding Bitcoin for the long term is a basic step to find better profits through Bitcoin, but altcoins will still lose out when compared to Bitcoin because they will not be able to surpass the Bitcoin system until any time.