I have been using CEXs without KYC for 7 years and have not experienced any problems. DEXs are not the best solution for everyone because they are very expensive in fees, do not support the right assets and networks, and have poor liquidity. I will switch to DEXs when one token to another is as cheap and hassle-free as on CEX, but until this happens, DEXs is not anything particularly unique that makes it worth abandoning CEX completely. 99% of the problems that arise due to working with CEXs are created by the users themselves. Whether this is the fault of the services themselves is a big question.