The truth remains that most altcoins are useless,~
Why you can conclude most altcoins useless? Do you get data from a certain source or you do your own research?
In my view, we only can say useless on most new altcoins, especially from ICOs. While for old or top altcoins are truly good and far away from useless as you said. Many people are investing in top altcoins, ex: ETH, XRP, ADA, BNB, LTC, XLM, TRX, etc. This is proof that those altcoins are useful, at least as digital assets.