Altcoins are necessary for the development of blockchain technology. But they may not all be successful. However, some subcoins may direct the blockchain ecosystem with the technology they offer.
indeed, everything doesn't always work, but in my opinion altcoin is still needed because the price is cheaper and suitable for long-term investment. it is very profitable especially if the price has gone up we can get big profits. especially the selected altcoins have good potential so it is very promising for the future.