The disadvantages of most altcoins is that they dont actually do anything. What is the purpose of having 1,000 clones of Ethereum? They all function the same, look the same, smell the same. Ditch them.
What? Are you mad or something? It's your opinion and I respect that but how can you say that it doesn't do anything? Well,infact, beginners invest to them. That is the evidence of how useful altcoin is to the newbies. On the contrary, maybe one noticeable disadvantage of altcoin is the unpredictable dumps of prices for we
cannot control this situation. That's really annoying and it has a big impact to other investors too.