And if that be so, then how is it helpful to be on the exchange after being hacked?
Not sure what you mean here? People should only use exchanges to
exchange funds, not
store their funds.
The problem is that some used to store their funds especially those who do day trading and it's in fact hassle to deposit and withdraw their funds. And you'll just be annoy if you miss those dump that you don't have any funds on your wallet.
So yeah, store funds you could afford to lose though.