After the whole issues of FTX my advice is though buying from CEX is safer but storing all your funds there should be avoided and for holders just stick with DEX.
I don't have any problem with CEX exchange, but I always advice people not to ever leave their coin on exchange, immediately you purchase your coin on CEX exchange, make sure you transfer all your coin to your non custodial wallet. You are advicing people not to leave all their funds on CEX exchange, you are encouraging people to leave some of their money on CEX exchange which I think is wrong, make sure you move all your funds from CEX exchange.
Don't you think Bitcoin could be more better without centralized exchanges than when we have them since all they could contribute is adding up alot of altcoins to pile up the whole crypto space and get people distracted towards investing on some of these coins at the end of their look for Bitcoin, to the best of my knowledge Bitcoin will be more under best of interest without them which will encourage having personal wallet that could be non custodial.
If we are to be honest, we all know both CEX and DEX exchange contribute to pile up of altcoins in Cryptocurrency space, we shouldn't blame only CEX for that. Am sure anyone that's really dedicated won't be distracted by altcoins, their are lot's of altcoins currently but people are still investing in bitcoin, anybody investing in altcoins those not have any excuse to give. I notice most people investing in altcoins are the once looking for fast money.