The problem with decentralized exchanges is that you have to have a deeper understanding about connecting your wallets to the exchange's smart contract. And trade execution is really 10x slower than the centralized exchanges. Maybe someday but not now.
Everything takes time, just like how Binance is as it launche before, more doubts and just time goes by it provides a better performance. They even add a Binance dex simce they see the potential to more trader who prefers a decentralized exchange than their normal exchange Binance. In time as more Dex exchanges appears we can identify whice are better to use in terms of trading, services, profits and performances.