Decentralized Crypto Exchages vs Centralized Exchange Like Binance or Bittrex?

The biggest threat to cryptocurrencies in not volatility, but the living reality that 99% of cryptocurrency trade still happens on centralized exchanges. And sometimes I think how contradictory it is to use centralized exchanges like Binance or Bittrex against the ethos of decentralized cryptocurrencies. Kind of joke and shame that the whole purpose i.e. monetary

No doubt that since the beginning centralized exchanges made cryptocurrencies like Bitcoin, Ethereum etc accessible to the masses around the world. And I am also acknowledging the fact that they did a very good job in providing the much need push and liquidity to crypto markets.