So basically you want and high reputable exchange that never be a victim of hackings or not possible to get hacked so it will be totally safe for everyone to store their funds? That kind of exchange won't be exist, hackers will be always smarter time by time. Also, everyone are supposed to not storing their assets on any exchanges. You can trade and make profit there but store your assets only on your private wallet.
We don't need to have that kind of exchange as we are supposed to trust no one.
Is that an intentional paradox?
The fox will eat the sheep if unattended by the farmer but the farmer must leave for 20 minutes each day and must keep the sheep safe. He can't take either with him and no one else is allowed to watch. Solve the problem (without digging holes or building fires).
I'm after an exchange that doesn't have inside attacks from it's staff which is clearly what happens (who stores 33% of their clients' funds on a hot wallet)? Where were the hacked funds sent to? How can we know they were hacked when no address proving the hacking was published (as far as I am aware at least)?