I think Altcoins or alternative coins were made to address some features that they believe the bitcoins are lacking. Some altcoins possess LSC like ethereum, cosmos, aeternity, tezos, etc. They offer low inflation rate, privacy, scalability and so on. They have unique special features. BUT overall, they are still far from what bitcoins have already accomplished. Altcoins are also a good investment if you want to have a coin investment portfolio but Bitcoin is still the best and safest coin investment for me.