how i look at CEXs, is that you trade on them and get out your funds as soon as you can. so the relationship is just very short. but sometimes there are other services such as staking or flexible savings like binance has. but as much as possible, if you want to avail other financial services, make sure it is very reputable as you can easily lose access of your own funds. if you are just doing the trading, better withdraw your money as soon as you finished the trade.
I see bloggers who show that they earn good money with the help of stanking on the exchange, for this they have to keep a lot of money on the exchange, I think this is too stupid.
By the way, my friend, who taught me to trade, constantly keeps some funds on the exchanges, since he is an active trader. I sometimes tell him about risks, but he tells me that there are always risks, but since he is an active trader, he is forced to do just that.