I think the exchange is a very important existence, which is convenient for traders to invest and understand the currency, especially for newcomers. Newcomers who have just entered the market can acquire a lot of knowledge in the exchange.
actually it is not right to invest in exchange instead use it as medium to buy your coin and put it to your own wallet,
never let your funds stay even overnight in centralized exchange mate , this is not safe for you and your funds.
I never let my funds in exchange even overnight because of many cases of hacking that happened in the past.
It is true to never leave money on exchanges centralized at the end of the day, as your money can disappear at any time but there is no denying that exchanges are extremely important. Like it or not, we will never get rid of it completely, without the exchange, the market will never grow. We would be in a lot of trouble without the exchange, I don't know what I would do to survive in the market if I didn't use the exchange because I am a trader.