I'm not sure if we need altcoin because I never try to trade in a particular trading sites such as binance. I just stick to coins.ph. I never try to buy altcoin that's why I don't think so that we need altcoin.
We need altcoin try you notice all projects connected to bitcoin are altcoin ,without them bitcoin will not be as powerful and as strong ,you should learn about altcoin deeper their platform becomes a major factor in a crypto exchange development