It is not safe to keep your tokens on the exchange. Having it in Daedalus is a bit safer, but a casual user can easily be compromised, hacked and lose his funds.
That’s why integration with the cold wallets (like Ledger Wallet) is very important.
Is Cardano working on a subject?
P.S. I know paper wallets are coming, but they are not as safe as electronic cold wallets.
(it shouldn’t belong is trading subforum, but I didn’t found better place)