What happened to binance, in my opinion is not a big deal to think the way you do. It's what every exchange should expect even the mightiest and work towards fortifying their structure more.
I think its a big deal because its about the security. If about security of our coin or token, exchanger should take a big step to improve their security. Perhaps, exchangers using cold wallet to avoid from hacking but its take a time when investor want to withdraw their funds.