Anybody simply leaving their coins on Bitcoin Core (encrypted)?
I think it is ok to let your coin rest in Bitcoin core wallet. And besides we all know that you can have total control of it because you can have the private keys.
what the title says 
I have already withdrawn my bitcoins from my poloniex exchange and have stored it safely in my electrum wallet in my laptop.Its because i read that most of exchanges might suspend deposits and withdrawals for 24 to 48 hours.Also,i read that transactions should be avoided during august 1.Thats why i have taken this decision.Yes. This is also high recommend to withdraw all your funds in a exchange and keep it somewhere safe like electrum because you have control of the seeds and private key.