If Bitcoin is also offering its own DeFi then perhaps you can make a fair comparison, but it's not. If you have DApps on Bitcoin then you can compare it with Ethereum, but it doesn't have them. If you can find a stablecoin on the Bitcoin blockchain then you may compare it with USDT on Ethereum, but Bitcoin doesn't have it. So there is really no reason to compare Bitcoin and Ethereum when each one of them is offering a different dish.
The crypto without bitcoin be without ....but now without ethereum? look the usdt is on ethereum defi is on ethereum binance coin is on ethereum ico using ethereum.
etheruem now in crypto is very imporant if tomrow btc will disapere nothing much happening but if ethereum will disapere a lot things will go wrong so etheruem must have good capabilities to carry all this alone.
First and foremost Ethereum wouldn't have existed had Bitcoin not paved the road first. If Bitcoin dies today, Ethereum as well as the rest of the world of altcoins might probably die with it. But if Ethereum dies today, I don't think Bitcoin will follow suit.
Bitcoin is important as Ethereum is also important. But crypto is more Bitcoin than Ethereum. Crypto will continue to live without Ethereum than without Bitcoin.
In fact, people on Ethereum and those who support Ethereum all support Bitcoin but not vice versa.