It is true to never leave money on exchanges centralized at the end of the day, as your money can disappear at any time but there is no denying that exchanges are extremely important. Like it or not, we will never get rid of it completely, without the exchange, the market will never grow. We would be in a lot of trouble without the exchange, I don't know what I would do to survive in the market if I didn't use the exchange because I am a trader.
In awaiting while DEXes will be developed enough to replace CEXes. Even now some trading can be done on DEX and modern DEXes are faster and easier than first ones. I'm sure we'll see some new generations of decentralized decisions for trading in not too distant future. And as for now we just need to consider risks every time our coins is not in our non custodial wallet.