Not all altcoin is useless because in fact there are some good coin nowadays despite of this current because of being have a strong structure behind. Which is it's up to you how to choose good project because only scam project nowadays is useless and turn into shitcoin always.
Do you think, the construction or structures of the code behind the cryptos are making it strong enough to be tough in the market? I guess they should put much effort especially the developers and team to increase the security of the blockchain they are using. In that case, we can have the assurance to transact with full security.