Crypro is a like a business, in order to attract investors you must do all the thungs to their investment safe from thieves /hackers, thats why strong security is the most needed by exchanges.
Exchanges are prone to hacking so its a must that they have a high security features to protect their exchange and the users.
Crypto became popular to many people now and the users are increasing as well, it also means those hackers who want to take advantage the weakness of newbies are active again to have a victim.
So be careful on where to entrust your crypto, if you're not going to trade it then dont let it sleep in exchange, use a wallet that you're the one holding your private keys.