I agree, but it's not just the use of CEX that is the problem here. It was the fact that dozens of red flags regarding FTX over the last few years were visible but actively suppressed as "FUD" by the crypto community.
People are acting like they are only seeing the signs now, the truth is that they refused to see them before.
The broader crypto space is more concerned with suppressing "FUD" than they are in keeping their house in order.