I don’t even believe that having Alticoins is diversification of portfolio, because most of these top Alticoins that are regarded strong usually follow the bitcoin trend, so why bother to invest in them when I can just earn same profit from a coin that is not centralized.
I personally agree that bitcoin performs better as an investment asset than altcoins. However, I cannot hide the fact that some altcoins also have the potential to generate returns regardless of whether they are investment or trading assets. You and I may be fine to be 100% on bitcoin and not diversify any assets into altcoins, but of course many altcoin investors also believe in the potential and the returns they will generate.
Regardless of whether altcoin prices follow bitcoin trends or not, what is clear is that the end goal of most traders and investors is to generate profits, not use cases. In fact both bitcoin and altcoins have such prospects because of their price volatility, so someone will definitely consider them regardless of whether we like altcoins or not.