And did you still use Polinex after your experience?

Nope, as soon as I got my Steem out I didn't look back.

I'm failing to understand what would that mean. What consequences should we expect?

No consequesnces except for the accounts of Binance and Bittrex hlding ore and perhaps some more trading volume on them. The point is that most people didn't move it back into Steem, they went straight to another exchange.

Perhaps it would create huge wave of panic.

I don#t think it would be panic, except for those whose Steem it was. THe rest of us benefit from Steem being destroyed or locked as it increases scarcity.