I'm also having the same questions running through my mind with such features I'm seeing. However, these are what I think.

• As of last year bull run, decentralized exchanges like Uniswap, Pancakeswap, Thor swap, and other dexes had incredible run and all were surrounded by different customers and since centralized exchanges are profit oriented, they are doing that to have their customers use one when there is demand, they get more profits from them.
• They want to take out decentralized exchanges out of the market. There is still speculations surrounding CZ and Binance for killing FTX, who knows if this is another trap to kick out decentralized exchange out of the market since another bull run is fast approaching as many expected.

Combining Cex and Dex is nonsense and pure trap, why create a seed for me that is connected to the internet and it's coming from an exchange, who will belive such that it's safe for me to use it as back up when I know that it will have a back door. Very soon, we will start to hear from customers that they have started to lose their coins that are been kept in exchanges.

Cex and Dex two different world, they should never coexist even for once.