Everyone chooses the best option for themselves. You are right about the update of wallets and the probability of hacking exchanges. I prefer to keep large amounts for me on purses that are installed on the computer, although there are risks with losing private keys, getting the virus on the computer and there is a possibility that the hard drive will fail and the wallet will be gone. In general, in this version, everything depends on you, and on exchanges you trust your money to strangers.