One of the main key points of Bitcoin is the decentralization of it.
Anything that is centralized should not be seen as beneficial for Bitcoin or the people using it.
I think it's just the fact that most people just want the convenience that comes with centralization, but that's a bad trade off.
Most people are too lazy to learn how to properly use a DEX. They prefer to trust a third party with their crypto just to avoid having the responsibility of securing the keys themselves. You would just deposit crypto in a CEX, start trading, and forget about the rest. Some DEXs have slow performance and utterly high fees due to the underlying Blockchain network's congestion, so don't expect CEXs to go anywhere soon.
While there isn't any "safe" centralized exchange, it's up to you to minimize losses by depositing only what you're intended to trade in the platform. The FTX collapse will force CEXs to provide proof of reserves, giving us a sign that regulators will be weighting on the industry very seriously. There isn't any indication people will stop using CEXs, so it's likely they will live alongside DEXs for generations. Just my thoughts