At least many altcoins price failed start year 2018 basically when bitcoin price drop out long. Especially investing is crypto also risk hits too so risk free better you can make learned trade. This crypto market so never response makes profits quickly so do invest long-trem and before observation about those projects.
l agree with your opinion since the beginning of 2018 altcoins started to get down, of course there were a lot of reasons. But it seems they keep still getting down, maybe the main reason is this epidemic. However as you above mentioned to prefer altcoins is so risky right now, it is no exaggeration to say that, l don't think all of them are useless, maybe top altcoins can be more profitable in the near future.