It is not at all questionable that we need crypto exchanges, but the problem is that some users consider them to be some kind of crypto banks, and that the security model is the same as in ordinary banks. Exchanges are for trading, not for long-term storage, which has been proven many times so far, especially in the case of Mt.Gox or Quadriga. The former are still waiting for partial compensation, and in the case of Mr. Cotten's story says that he literally spent a good part of the funds on bad investments, and part of it allegedly went to the grave with him.
The whole idea around Bitcoin is decentralization, and the fact that the largest CEXs have millions of Bitcoins in their possession is not something we should look forward to.
I read cases of MT Gox and another I read was Hot Mail. The later, early miner's of Bitcoin lost huge Bitcoins in those exchange and they have been one of the first exchange around those first few years Bitcoin started buzzing. Some 15
BTC 20
BTC and some others I can't recall all got lost.
A pal from what I read had to write bto Hotmail if they can get his mail revamped but all fell on deaf ears as they couldn't provide any solution for him.
I have also seen ledger wallet's are not too costly ($50) cheap, but cheaping from the state's according to the site might get everything too long.