People who keep bitcoins and invest in altcoins are basically the worst fools in the modern age, because investing in bitcoins has the most benefits and the least risk. Those who have invested in Bitcoin have largely succeeded, and those who have invested in Altcoins have failed because Altcoins are constantly being wiped out of the market.
What do you mean by saying they are the worst fools in modern age investing in alt coins? That means are you saying that we should not invest in altcoins? Maybe you need correction because there are many examples of people who have been able to make a lot of money by investing in altcoins. Yes investing in alt coins is risky doesn't mean investing in these coins would be the worst fool. Profits will be earned if you invest in potential altcoins like BNB, Ethereum, Solana, Litecoin and hold for a long time.
Investing in potential alt coins has less risk. But if you invest in Memcoins or Shitcoins there is a high risk of losing your money.
I don't think everyone who invests in altcoins is stupid, because there are some altcoins that have good fundamentals for the long term as you mentioned. It's just that many novice traders who invest in altcoins actually lose, actually this is all their own fault because they don't do research first and the worst thing is that these novices invest in new altcoins. Many can profit from altcoins and many also lose from altcoins. Most altcoins are not for the long term, so if you don't have the skills to analyze altcoins, it's better to invest in bitcoin because bitcoin has been tested from the past until now.
Altcoins are deadly, it's true, especially if there is no good research and understanding. Altcoins are also not for the long term, if you want to invest with small risks and want to create financial freedom in the future, then bitcoin is better than altcoins.