Yes it's true that Ethereum and Bitcoin values fluctuate around the same!
But this is nowadays. There aren't many news about Ethereum!
We already have seen in the past ETH running and Bitcoin stable!
When some news come out you will see ETH running and BTC stable.
Unlike shitcoin, Ethereum and Bitcoin do not need to have good news to increase the value. The price of Bitcoin and Ethereum depend on the demand and FOMO, FUD in the market. Example Bitcoin, if it has not FOMO, it can not breakout $7,000 today.